Frequently Asked Questions…….

What is the process of sending a replacement battery to SUMATOTEK Service Center?

A. If you have a faulty Sumatotek Lithium Battery which you want to send for replacement, please follow the below steps to ensure you get the fastest service.

  1. Note down the Serial Number/Barcode of the Battery. You can find the Barcode/Serial Number of the Battery on the sides of the battery & on the Warranty Card of the Battery. Take a picture of the Serial Number.
  2. Search for & take a photo of the Warranty Card with visible Serial Number/Warranty Card.
  3. Search for the original invoice of your product. It will be required for warranty claim.
  4. As mentioned on the Warranty Card, customers need to register for warranty at the time of purchase. They will receive a confirmation of their successful warranty registration on their mail. Keep in mind that you cannot register your battery for warranty 15 Days after the date of purchase. In case you do register after 15 days, the registration wont be accepted.
  5. Raise a Ticket on our SUMATOTEK Support Page. Don’t forget to mention correct Serial Number/Barcode on the ticket. This step is very important as without a ticket your battery even if received at our service centre wont be processed for replacement until a ticket is raised. The product may also get lost without a valid ticket number or without a valid serial number.
  6. Stick a label on the battery with the correct ticket number, your name, contact details and then courier/drop the battery at our service centre. Once you send the battery to our service centre you are bound by our Warranty Policy & Service Policy as mentioned on our website.
  7. If you want to send a charger, raise a separate ticket for charger or clearly mention the serial number of the charger in the ticket raised for the battery. Without a separate ticket for charger or serial number of the charger in the ticket the charger could get lost and Sumatotek wont be liable for any such loss.
  8. If you are sending the product by courier, do not forget to mention the tracking number on the ticket. Sending such details on Whatsapp or over phone may result in loss of product or non receiving of the product. A copy of the intimation can be sent over Whatsapp for faster response.
  9. Always send by courier/transport which can deliver directly to the Service Center. A receiving is must to validate that the product has indeed been received by the Service Center. You can also ask the Service Executive to arrange pickup for you. Any loss or damage during transit is not the responsibility of the Service Center. The customer is requested to add an insurance before shipping the product to & from the Service Center. The insurer’s terms & conditions shall apply for such damage claims.
  10. All reports will be uploaded on the ticket & any objection to any step in the process can be replied to on the ticket. No other forms of communication will be considered an official mode of communication with the SUMATOTEK Service Center.

    Warnings :
  11. SUMATOTEK Service Center does not hold any responsibility for any lost material even after receiving the battery if the serial number mentioned on the Ticket is incorrect.
  12. In case of Water damage cases all proofs will be uploaded on the corresponding ticket to which the customer must reply or visit for any objection within 7 days. Post which any objection wont be considered.
  13. Any material shipped to & from us is the liability of the customer during transit unless insured by an insurance company.
  14. Charger if sent with the material must be informed with serial number on the ticket. Without any prior information no claims of said chargers will be processed.

Q. My SUMATOTEK Lithium Battery is giving less than rated mileage, what should I do ?

A. If your SUMATOTEK Lithium Battery is giving less than rated mileage then here are a few things you can do before you take your battery to the service centre. Keep in mind that degradation is a natural process and cannot be reversed by any means.

Answer these questions before you check the steps below :

  1. When did you purchase the battery
  2. How much old is your battery in months
  3. Do you use the complete capacity of the battery daily / Do you discharge the battery completely daily ?
  4. Do you ride alone or with 2 or more passengers on a regular basis?
  5. When was the last time you serviced/balanced your battery?
  6. Do you regularly accelerate the vehicle at higher speeds or driver roughly?

    Once you have answered these questions then you can proceed to reading the steps below.
  1. Tyres should be filled to the desired tyre pressure level. A lower tyre pressure will lower the mileage of a vehicle.
  2. The wheels of the vehicle should be able to run freely when no power is connected. If the brakes are constantly applied upon the wheels even without the user braking the vehicle, it can result in more than desired current draw from the battery which will lower the mileage.
  3. If any component of the vehicle, controller, converter or motor is faulty then it may consume extra current. This can be checked simply by checking whether they over heat during use, since any unused current will be translated to heat and will lower the vehicle’s mileage.
  4. Also remember than the rated mileage is stated for single rider at low speeds, so in case you are riding at a speed higher than the rated speed and with 2/3 passengers or with extra load then it is very normal to get a mileage that is lower than the rated mileage.
  5. Also if you are using the battery for a long period of time then you can expect a natural decrease in the battery overall mileage due to the natural detoriation of the battery health over time.
  6. If you haven’t used the battery for a long time or even when a new battery leaves from the factory, remember to use it for a few cycles before you can get the maximum mileage out of the vehicle. Storing a battery for a long time lower its output capacity which can easily be restored in cases of lithium batteries by charging & discharging it for a few cycles.
  7. In winter , you can expect a less than rated mileage since lithium batteries give less than rated output capacity at low temperatures. So if you are experiencing this then this is a normal experience & your battery could be absolutely fine provided it doesn’t have a damaged BMS or an internal faulty cell which can be checked by following the steps below.
  8. If the Battery is being charged to the optimum level or whether it reaches the upper cutoff voltage level of the battery as mentioned in the product specifications. Batteries may not full charge due to a lot of reasons including a faulty charger, faulty BMS or even a cell failure inside the battery. Try changing the charger to check whether a different charger solves our issue. If not then proceed to the next step.

    Upper Level Battery Cutoff Voltages are :
    1. 54.6V for a 48.1V (13S) Battery
    2. 67.2V for a 59.2V (16S) Battery
    3. 71.4V for a 62.9V (17S) Battery
    4. 84.0V for a 74.0V (20S) Battery
    Please note that the actual battery voltage could be a few millit-volts lower than the rated Upper Cutoff Battery Voltage.
  9. Discharge the battery completely to check the Lower Level Voltage Cutoff of the battery, the Lower level Voltage Cutoff of the battery should be as per the product specifications mentioned in the product description. If the battery cuts off at a voltage higher than the rated Lower Cutoff Voltage then there might be an issue with the BMS or an internal cell failure.

    Upper Level Battery Cutoff Voltages are :
    1. 39-41V for a 48.1V (13S) Battery
    2. 48-50V for a 59.2V (16S) Battery
    3. 51-53V for a 62.9V (17S) Battery
    4. 60-63V for a 74.0V (20S) Battery
    Please note that the actual battery voltage could be a few Volts higher(depending on the load applied) than the rated Lower Cutoff Battery Voltage.
  10. Finally measure the Individual row Voltage of a Battery Pack. If you dont know how to do so, you can learn on how to check individual row/string voltages of a battery pack by clicking on the link. Enter these values in the Battery Health Calculator and analyse the reports. A % of Unbalance below 1% indicates a good state of health & even if the mileage issue persists then the BMS could be at fault, but always remember to check whether the BMS is overheating or whether there is any difference in voltage before or after the BMS terminals, if the BMS also seems fine then recheck the steps above & re-analyse. Above 1% State of unbalance indicates a possible failure in any cells within the pack.

Q. How to check the string /individual row voltage of a SUMATOTEK Lithium Battery Pack?

A. Lets take an example of a 48.1V SUMATOTEK Lithium Battery. It has 13 Strings or 13 Rows connected in series. The BMS connector in the picture has 14 wires. You can access this connector by opening the Battery Box Cabinet Cover and after disconnecting it from the BMS. Remember to follow the Safety Instructions given at the end of this FAQ.

C0 : This is also the negative terminal terminal of the Battery Pack. It is also connected internally to the BMS at B- Terminal.

C14 : This is also the positive terminal of the Battery Pack. It goes straight to the output terminals & is also accessible via the Industrial & Charging Connectors. Note : The Main Red(+Ve wire : 4Sq mm ) is directly connected to the connectors. It is not connected to the BMS.

C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13 : These pins are connected to individual rows in the pack.

Our task is to measure the voltage between these pins. If you are using SUMATOTEK Service Battery Health Calculator to analyse your battery health report then you need to measure B0, B1, B2, B3, B4, B5, B6 ,…..B20.

B1 : Voltage Between C0 & C1. If you are using a multimeter (Set the Multimeter to 20V DC Setting) then the Negative Lead(Black Lead) will be placed on C0 & Positive Lead(Red Wire) will be placed on C1. Note down this Voltage, it should be within a range of 0-5V.

B2: Voltage Between C1 & C2. If you are using a multimeter (Set the Multimeter to 20V DC Setting) then the Negative Lead(Black Lead) will be placed on C1 & Positive Lead(Red Wire) will be placed on C2. Note down this Voltage, it should be within a range of 0-5V.

B3: Voltage Between C2 & C3. If you are using a multimeter (Set the Multimeter to 20V DC Setting) then the Negative Lead(Black Lead) will be placed on C2 & Positive Lead(Red Wire) will be placed on C3. Note down this Voltage, it should be within a range of 0-5V.

B4: Voltage Between C3 & C4. If you are using a multimeter (Set the Multimeter to 20V DC Setting) then the Negative Lead(Black Lead) will be placed on C3 & Positive Lead(Red Wire) will be placed on C4. Note down this Voltage, it should be within a range of 0-5V.

B5: Voltage Between C4 & C5. If you are using a multimeter (Set the Multimeter to 20V DC Setting) then the Negative Lead(Black Lead) will be placed on C4 & Positive Lead(Red Wire) will be placed on C5. Note down this Voltage, it should be within a range of 0-5V.

Keep repeating it until you reach ……………………….

B13: Voltage Between C12 & C13. If you are using a multimeter (Set the Multimeter to 20V DC Setting) then the Negative Lead(Black Lead) will be placed on C12 & Positive Lead(Red Wire) will be placed on C13. Note down this Voltage, it should be within a range of 0-5V.

SAFETY INSTRUCTIONS : Do not short the Connector Pins while measuring with the multimeter leads. If the leads touch each other while they are placed on the BMS Connector pins, it could short that particular string/row. Also do not press the Multimeter lead too hard while measuring the voltages, press gently or it might damage the connector. Do not bend or twist the connector in any way while taking it out from the BMS. Pull the connector out slowly in the direction of the connector.

Q. Can I take out my SUMATOTEK Lithium Battery out of my OKOYAMA Electric Scooter to charge it? or Is my SUMATOTEK Lithium Battery detachable ?

A. Yes, You can charge your SUMATOTEK Lithium Battery directly with a SUMATOTEK Lithium Charger. You can detach the SUMATOTEK Lithium Battery from your OKOYAMA Electric Scooter & charge it in your home/office or any other place.

SUMATOTEK Lithium Batteries generally posses 2 connectors :

  1. White/Industrial Connector : For Discharging / Charging.
  2. Black/3-Pin Socket : For Charging.

You can insert the charger in both the connector depending on the charger type.

Q. Can I tilt/change orientation of my Sumatotek Battery during installation?

A. Yes, You can.

Lithium Batteries are completely dry batteries with no spilling issues unless physically punctured. You can install the battery in any orientation in your Electric Scooter but keep in mind that the BMS is installed on the top of the battery. So do not completely invert the battery’s orientation (upside down) because doing so might put the pressure of the battery on the BMS. The weight of the battery might damage the BMS.

Q. My Sumatotek Charger keeps on charging my Sumatotek Battery for hours and yet the Battery doesn’t full charge? What should I do?

A. First, of all check your average charging duration using our Charging Calculator on our website. You have to select the Ah (Capacity of the Battery) & the A(Ampere) of the Charger.
For eg for a 60V 6A Charger & a 60V 25Ah Battery, Ah value is 25 & A value is 6. When you select these 2, you get the expected charging duration.
Incase your charger is charging for more than the expected charging duration, then check your input supply voltage. In areas, with low input voltages, charging could be slow. Also make sure you don’t use very long extension cables to charge the scooter. It could result in a drop in current output & voltage output.

Even after following all these steps, the charging durations is more than the expected charging duration, you should visit your nearest service centre and look for a replacement. Your charger might be giving less current output than what is rated on the charger.

Q. What should I do if my Sumatotek Battery has been damaged by Liquid/Water?

A. If your SUMATOTEK Lithium Battery has come in contact with water, please take it immediately to your nearest dealer and inform him of the same. If you do not take action immediately and wish to delay or not report the incident to the dealer it may damage your SUMATOTEK Lithium Battery permanently. The dealer will take immediate action and ensure that the water doesn’t stay inside the battery. He will open the battery and dry it completely from inside out. He may also need to send the battery immediately to the SUMATOTEK Company Service Center for a thorough checkup. Keep in mind, Fast Action may save your battery. But if you do not report it then the damage due to water retained inside the battery will be permanent and your battery may not be repairable.

NOTE : Once water goes inside the battery by any means, intentional or accidental your battery will be out of warranty but note that we will try our level best to repair it at a nominal cost after the permission of the customer and all charges are to be borne by the customer in that case.

Q. How to protect my battery from Liquid/Water Damage? or What are the ways in which my Sumatotek Lithium Battery may get damaged by Liquid/Water?


Q. I have received/purchased a new SUMATOTEK Lithium Battery. I am facing few issues in starting my battery. What should I do?

A. If you have purchased a new SUMATATOTEK Lithium Battery and you have trouble starting your vehicle then there are a few steps you should follow. The steps may be different for a dealer or a customer.


  1. Check your battery carefully for any signs of physical damage due to transportation. If you find any visible signs of damage immediately inform a SUMATOTEK representative or your nearest point of purchase.

  2. Check the battery carefully for any signs of physical damage due to transportation. If there are any physical signs of damage , you must immediately follow these instructions.
    1. Assess the severity of the mechanical damage. Check the battery voltage on both the connectors. Insert a charger into the charging port and check if the battery is charging properly.
    2. If the battery is damaged severely, always ensure that the battery is safe from fire hazard. Open the battery while making a video, check if any BMS sensing wires are cut, any +ve or -ve wires are broken loose from their joints, all metallic areas are insulated and no cell should be puntured or physically damaged.
  3. If there are no signs of physical damage, check the battery voltage. If the battery shows voltage, then charge the battery via the charging connector. If the battery doesn’t charge or discharge then the BMS Connector might be loose. Read how to Fix a loose BMS Connector.

Q. How can a Lithium Battery catch Fire? And How can we prevent this?

Please watch this video on our channel by OKOYAMA Electric Scooters. It explains in detail on how, Electric Scooters Catch Fire.
A. Lithium-ion Batteries, or Secondary Batteries, are rechargeable and provide high energy density. These batteries contain no free Lithium metal but do contain Lithium Ions and highly flammable electrolytes. Common applications that incorporate li-ion technology include laptops, cell phones, electric vehicles, hospital equipment, and energy storage systems, Electric Vehicles to name a few. If you visit the Wikipedia page for Lithium Ion Batteries it contains a list of the various type of batteries in this category based on their different cathode material :

  1. Lithium Polymer Battery
  2. Lithium Cobalt Oxide
  3. Lithium Iron Phosphate
  4. Lithium Manganese Oxide
  5. Lithium Nickel Manganese Cobalt Oxide

All these batteries operate on a similar principle of a cathode, an anode, and an electrolyte.

Lithium batteries are capable of spontaneous ignition and subsequent explosion from overheating. That may be caused by –

  1. Electrical Shorting
    1. Due to external shorting of wires within the Electric Vehicle wiring.
    2. BMS Failure in which the BMS is shorted internally due to a component failure.
  2. Rapid Discharge
    1. It can happen when the vehicle is overloaded or is carrying weight beyond its rated Capacity.
    2. The vehicle is very old and unmaintained and thus it draws more current than required.
  3. Overcharging
    1. It can happen due to use of Over Rated Charger or use of LEAD ACID Chargers with Lithium Batteries.
    2. It can happen due to the malfunctioning of charger leading to a higher than rated voltage.
  4. Manufacturers Defect
    1. Missing insulation between cells to provide for proper protection from inter heating or shorting exchanges.
  5. Poor Design
    1. If the battery box is sealed without proper heat dissipation then temperature could rise within the cabinet when the battery is charged or discharged. Using high current fast chargers can also increase the battery temperature, while heavy loading on a long trip could also increase the battery temperature significantly. With no vent for hot air inside the battery box, temperatures could rise significantly leading to a thermal runway condition.
    2. The BMS also heats up significantly therefore proper heat sink must be provided to the BMS with vents for the hot air to escape.
  6. Mechanical Damage
    1. If any cell is punctured then it could heat up and start a spontaneous fire. It could happen due to transportation damages or any accidental damages.

      Overheating results in a process called Thermal Runaway, which is a reaction within the battery causing internal temperature and pressure to rise at a quicker rate than it can be dissipated.


      Lithium Battery fires are rare but they can range from minor sparks to deadly explosions. As all technologies we use in our day to day life, we all need to be aware of the hazards of lithium batteries which will lead to fewer fire cases. Follow these precautions to prevent a lithium battery fire incident.

      1. To prevent Electrical Shorting : always get a trained technician to wire SUMATOTEK Battery to your vehicle. Take care that there should not be any loose wires in the vehicle which can cause an electrical short.
      2. To prevent Rapid Discharge : always drive the vehicle at a nominal speed. Do not accelerate or increase the speed quickly. It is recommended that you drive slow specially with heavy loads or multiple passengers. Always service your vehicle at regular intervals to prevent excess current being drawn by motor and controller.
      3. To prevent Overcharging : always use a authenthic SUMATOTEK Charger with SUMATOTEK Batteries. You can find the max charging voltage mentioned in the product description of all our products.

Q. I want to purchase SUMATOTEK Battery on EMI. Is EMI Option Available? How to purchase on EMI?

A. All SUMATOTEK Batteries can be purchased on EMI. At present EMI Payment Option can be used in 2 situations :

  1. The customer must have a credit card of any Indian Bank.
  2. The customer has a verified account on Zest Money.

    Either One of the above 2 criteria must be fulfilled to get EMI on SUMATOTEK Batteries.

    Once you confirm your order , please speak to our marketing executive and tell him/her that you want to use EMI Payment option. He/She will take your mobile number and then send you the link with the Total Invoice Value + Credit Card Charges. You will receive this link on your mobile number given to the marketing executive. Click on the link and you will find a payment gateway in which you can select EMI Option. Now you can choose your desired time of repayment and the bank. Please note that the marketing executive has no role in giving you EMI other than sending you the link and calculating the total amount. You can choose a variety of options once you open the link.

    Another way you can do this is by purchasing the product on the SUMATOTEK website and then go to the checkout page. You will find an EMI option there and then you can follow steps similar to what was mentioned above.

Q. I was checking out the Product Description of a SUMATOTEK Lithium Battery. On a particular product eg. 60V 30Ah, it is mentioned that the mileage is 80-100Km. What does it mean, please explain?

A. The mileage mentioned on the website gives only an approximate representation of the actual mileage you will receive while driving on road. The mileage is defined for a single person with an average weight of 60-80Kgs. The mileage is expressed in terms of a range and the lower limit is for slightly higher speeds (40-50Km/Hr) and the upper limit is for low speeds (25-30Km/Hr).

Since SUMATOTEK sells batteries for all compatible Electric Scooties in the market, you might experience different mileages in different vehicles under different conditions.

4 Factors affect the mileage of your vehicle while using SUMATOTEK Battery

  1. Type of Vehicle
    1. Motor Wattage :
      1. Low Power – Upto 500W
      2. Medium Power – Upto 1000W
      3. High Power – Greater than 1000W
    2. Controller Type :
      1. Sinusoidal : It consumes less power and is more efficient.
      2. Square Type : It consumes more power and it less efficient.
    3. Vehicle Loading :
    4. Road Type :
    5. Driving Pattern :
    6. Vehicle’s Condition : If your vehicle is old and worn out, chances are your brakes have accumulated dust and might exert a constant pressure on the wheels. If such a condition happens , you may experience less than rated mileage. It is recommended that you service your vehicle regularly, keep the brakes friction free and ensure that the wheels run smoothly even when power is not turned on.
    1. Tyre Pressure : Under low tyre pressure you may experience less than rated mileage. When tyre pressure is low, motor requires more power to drive the same load. It is recommended that you fill the tyre to the optimal pressure to experience the rated mileage.

Q. I have received 2 connectors with my newly purchased SUMATOTEK Lithium Battery and Charger. What should I do with them or how should I use them with my Electric Scooty?

A. First of all, congratulations on your newly purchased SUMATOTEK Lithium Battery and Charger. When you unbox your battery and charger you may find 1 or 2 types of connectors within the package contents depending on your choice of items during purchase.

  1. Industrial Connector: Discharging / Charging
  2. 3 Pin Socket: Charging Only

    The 1st connector or the Industrial connector is a 50A rated heavy discharge connector suitable for heavy load applications. Use this connector to attach the SUMATOTEK Lithium Battery to the Electric Scooter. This connector will be connected to the Positive and Negative Battery connections of the controller.
    In the case of an old model Electric Scooter, these Positive and Negative Battery connections are the same that were previously connected to the GEL Batteries. Note that in the case of GEL Batteries there are 4/5/6 batteries connected in series and therefore you will find the Positive connection at the Positive Pin of the 1st Battery and the Negative connection at the Negative Pin of the Last Battery (4/5/6th Battery for 48V/60V/72V respectively).
    Do not forget to insulate the connection before you connect the battery and always remember to turn off the MCB and then connect the battery.

    The 3 Pin Socket is an additional socket that may or may not come to your use depending on the model of the Electric Scooter you are using at the moment. This connector is provided to replace the charging socket provided below the seat which is used to charge the battery without opening the scooter seat or the boot space. Different vehicles have different wiring connections. The connector has 3 terminals but only 2 are used. The polarity of the connector is given in the product’s description.
    Once you have installed the 3 Pin Socket always remember to check the polarity of the charger and the 3 Pin Socket and ensure that the positive pin of the charger goes into the positive pin of the connector. If the connections are reversed then the charger may get damaged and such chargers are not covered under warranty.
    Do not use the 3 Pin Socket for discharging the battery. It has a maximum rating of 10A and may pose a fire risk due to excessive heat if loaded with high currents.

Q. How to fix a loose BMS Connector issue in a SUMATOTEK Lithium Battery?

A. If you are facing one or multiple of the issues mentioned below then follow the simple steps mentioned below. We strongly recommend that you keep an experienced technician by your side or get your battery checked at your point of purchase.

1. After I connect the charger to my battery, the charger FAN or Charging Indicator doesn’t turn on. To put it simply: The Battery doesn’t charge.
2. After the installation of SUMATOTEK Lithium Battery, the vehicle display turns on but when I sit on the vehicle the motor is unable to run.

Tools Required: A Multimeter, A Screw Driver, A Smartphone.

Note : In case you are unable to follow STEP 1 you can directly follow STEP 2.

STEP 1 [ Test ]: Measure the voltage of the SUMATOTEK Lithium Battery when not connected to the vehicle. Note down the reading. It should be within the range( Between the Lower Cutoff & Upper Cutoff) specified in the individual products’ technical description. Now connect the SUMATOTEK Lithium Battery to the vehicle and turn on the MCB and the key. Again measure the voltage of the battery. If the voltage reading drops to 0Volts or less than 10Volts or below the Lower Cutoff(as specified in the product’s technical description), then you need to follow the next step mentioned below.

STEP 2 [ Solution ]: The Battery Pack is managed by a BMS (Battery Management System). The BMS has multiple wires connected to a connector which is connected to each row of the battery. It is highly likely that during transportation the connector as shown in CASE A & CASE B might have gotten loose.
Under the supervision of an experienced technician open the battery and simply reconnect the connector as shown in CASE: C . Pull the connector out carefully without bending it. Bending the connector can damage the connector pins by breaking the soldering points.

Note : Always makes a full single video while opening the battery. Follow the safety instructions mentioned in a similar FAQ about how to safely open the battery in case the need arises. The video will act as proof that you have followed all the guidelines regarding opening the battery as mentioned on our website.

BMS Connector Scenario Diagram

NOTE : Always take prior written permission of authorized SUMATOTEK representative over mail/Whatsapp for opening of SUMATOTEK Lithium Batteries. In case of lack of video proof or without any written permission, you may loose your warranty.

Q. Should I water wash my Electric Scooty? How will it affect my Warranty?

A. No and Yes. If you are confused then let us clear your confusion.
You should not water wash your vehicle with your SUMATOTEK Battery inside the vehicle. Lithium Batteries can be permanently damaged if exposed to water. You can read our blog for the detailed effects of Water on Lithium Batteries.

However, you can water wash your vehicle without the SUMATOTEK Battery inside. As a precautionary step, you should take out the battery, keep it in a safe, cool place, and then wash the vehicle. Also keep in mind that very high pressurized water jets can also get inside the motor if the motor fittings are loose. This happens rarely but it is possible, Install the SUMATOTEK Battery only when the vehicle is completely dry.

If you wish to clean the SUMATOTEK Battery, then use a slightly wet cloth or an Ethyl alcohol/water mix cloth to wipe the battery clean.

Please note that the Warranty of SUMATOTEK Battery is void in case of liquid damage or liquid ingression.

Q. Where should I install my SUMATOTEK Lithium Battery in my Okinawa Praise Scooty Model?

A. Vertically standing up or on the Sloped Section beneath the Seat. Okinawa Praise is a unique vehicle compared to all other electric vehicles out there. Its battery compartment is longitudinal and starts from below the seat to the end of the leg rest. Its ground clearance is also very low compared to other Electric Scooters. Do not install the battery beneath the leg rest. During raining season if you encounter a pothole filled with water then water might seep into the lower section of the battery compartment. Any contact with water will lead to accelerated corrosion of the battery and its parts. Keep in mind that this is a very important point for areas with heavy rain and coastal districts.
As a good practice, you should install the SUMATOTEK Lithium Battery in 2 ways.

  1. The 1st way is to install it vertically standing up. This will lead to an end of the trunk space and you will have to cut the trunk bottom so that the battery can stand vertically. Okinawa uses the same method of installation in their new models which comes with Lithium-Ion Batteries. Check out this SUMATOTEK YouTube Video on our installation guide.
  2. The 2nd Way is to install it just below the seat at an inclination of about 30Degrees. The inclination is important as it prevents any water from accumulating near the surface of the battery. The top lid of the battery is now at a good height from the ground.

In both these methods you should note that proper packing must ben given so that the battery doesn’t move when the vehicle is running. It may cause snapping of connectors, loosening of welding points and any unintended issues within the battery. The packing must also ensure that the heat of the battery is not trapped within the packing. Do not use flammable materials or heat insulating materials for filing up the empty space near the battery. Weld seal metal clamps to hold the battery in place or place wooden planks to keep them from moving.

Q. When should I charge my Battery? or What are the Best Charging Practices?

A. You should charge your battery daily. Please note that even if you use the SUMATOTEK Lithium battery for only a small period of time or for a few KM’s per day you should charge your battery daily. For customers who don’t use the vehicle much, even if your battery runs for 2-3 days (or higher) you should not let the battery drain completely before you charge. The same applies to customers who have a high daily usage. The battery should not be drained completely. It should at least have a minimum charge of 30%. Deep Discharging a battery will lead to a decrease in its life time.

Preferred charging time is Late Night to Early Morning when the surrounding is cool and the ambient temperature is at its lowest. Charging the battery raises its temperature by a few degrees and it’s recommended that you charge the battery when the ambient temperature is at its lowest especially in the summers.

Even though SUMATOTEK Lithium Batteries can be charged with a high capacity charger and in a very short duration, it is advised that you charge your battery with a SUMATOTEK Lithium Charger that suits your daily needs and has a low current output. Keep in mind that this is only a recommendation and there is no harm in using a SUMATOTEK FAST Lithium Charger. Slow charging doesn’t heat up the battery much during charging thereby improving battery life.

After using SUMATOTEK Lithium Battery especially during the daytime you should not put the battery to charge immediately. During discharge the battery temperature increases and if the surrounding temperature is high then charging the battery immediately might be hazardous. It could also pose a Fire Risk due to a further increase in temperature. Give at least 30Min to 1 Hour gap after usage before you put the battery to charge.

Q. How do I register my newly purchased SUMATOTEK Lithium battery for Warranty?

A. First of all, Congratulations on being a proud owner of SUMATOTEK Lithium Battery. In order to register for warranty follow the following steps:

Sumatotek Lithium Battery Warranty Registration Poster - 3 Simple Steps
Sumatotek Lithium Battery Warranty Registration – 3 Simple Steps
Sumatotek Warranty Registration Mobile View
  1. Open the company website @SUMATOTEK.
  2. Now you need to login into your SUMATOTEK Account to register for your warranty.
    • Desktop View: Click on the “My Account” tab on the top right corner of the homepage.
      • Create your new account or log into your existing account with your username, password or by using social login.
      • Once you have logged in to your SUMATOTEK Account, you need to click on “Warranty Registration“. You can find this in your My Account menu located on the right-hand side hand of the “My Account” Page.
      • After you have clicked on the Warranty Registration menu, you can see that your name, email, and phone numbers are auto-filled from your profile details. You can edit them if you like.
      • Fill out the remaining details.
    • Mobile View: Click on the “My Account” tab on the left bottom corner of your Phone Screen.
      • Create your new account or log into your existing account with your username, password or by using social login.
      • Once you have logged in to your SUMATOTEK Account, you need to click on “Warranty Registration“. You can find this in your My Account menu located in the middle of the screen and 6th after the “Account Details” tab.
      • After you have clicked on the Warranty Registration menu, you can see that your name, email, and phone numbers are auto-filled from your profile details. You can edit them if you like.
      • Fill out the remaining details.

Q. My vehicle charging connector is different than that of the SUMATOTEK Lithium Charger. What should I do?

A. You need to change your vehicle charging connector. We provide a compatible female connector with our SUMATOTEK Lithium Charger. Remove the battery first, then connect/solder the wires carefully with the connector provided. Be careful to check the polarity of the connector after you have connected/soldered the wires with the connector. Also, note that in case you exchange the polarity (connect the terminals wrongly or in opposite direction) of the connector then the charger might get damaged. So be careful before you connect the battery or charger. Double-check the connections and verify if they are connected and insulated properly.

Q. Should I use my existing LEAD-ACID/GEL Battery Charger to charge my new SUMATOTEK Lithium-Ion Battery/Lithium Ferro Phosphate Battery?

A. No, we do not recommend using your existing LEAD ACID/GEL Battery Charger for your new SUMATOTEK Lithium-Ion Battery / Ferro Phosphate Battery. Even if the upper cutoff voltage is the same, LEAD ACID/GEL Batteries use Constant Voltage Charging Methods while Lithium-Ion Battery Chargers use Constant Voltage and Constant Current Methods to charge the battery. Simply put, one can say that when the Lithium Battery Voltage is low, Lithium Charger lowers its voltage while delivering constant current and as battery voltage reaches within 90% of its upper cutoff voltage, the Lithium Charger decreases its current while keeping the voltage constant. however, this doesn’t happen with the LEAD ACID/GEL Battery Chargers. The LEAD-ACID/GEL Battery Charger can charge the Lithium Battery but it will hamper the No. of Cycles of the Lithium Battery. It might also pose a fire hazard in case of overcharging since low-cost LEAD ACID/ GEL Battery Chargers are quite popular and do not have strict upper cutoffs, which is very important for Lithium Batteries. Lithium Batteries tend to heat up or cause fire hazards if the cell voltage exceeds its maximum ratings even by a few millivolts.

Q. My SUMATOTEK Lithium-Ion Battery mileage is less than what is shown on the website. What should I do?

A. If you have recently purchased a new SUMATOTEK Lithium-Ion Battery then we recommend you

  1. To service your vehicle for optimal tire pressure and no friction between the brakes and the wheels.
  2. In addition to this, you can also check your horn and light for any damages as they consume extra power when not in working condition.
  3. The wheels should be free to rotate by hand when power is switched off.

    ->Even after doing all the above, your mileage doesn’t improve then you must check
  4. If your charger is properly charging the battery to its fullest. All full charge voltages are mentioned in the product description. Please ensure the battery is charged to its fullest.
  5. Also, discharge the battery and check if the Lower CutOff Voltage falls within the same range as specified on the individual item description.

    ->Even after all these steps if your mileage doesn’t improve check the Stall Current consumption of the motor.
  6. Stall Current Consumption refers to the current consumed by the motor when there is no load i.e no one is sitting on the vehicle. The Current Value should within 5-7A for most vehicles or even lower for low-powered vehicles. If it is higher than 10A then your motor is consuming more power than required.

    ->Further, if your issues are not resolved then you can check
  7. If the battery pack is balanced i.e all rows are at the same voltage. If they are not balanced then the battery 🔋 will not deliver its maximum mileage. But if they are balanced then the issue might be elsewhere.

    Finally the ultimate test would be to put the battery in a charging-discharging machine and check the Battery Capacity. If the Battery Capacity is within 90-100% of the rated value and the rows are balanced then the battery is ok and you should check or change the vehicle. If the battery capacity is less than 90% and the rows are unbalanced then you should send the battery for replacement in case of warranty.

Q. Previously my vehicle had GEL Batteries inside. Will SUMATOTEK Lithium-Ion Battery fit in my existing vehicle?

A. If your Electric Vehicle had GEL Batteries then there is a high chance that SUMATOTEK Lithium Ion Batteries will fit inside. Lithium-Ion Batteries are roughly half the size of LEAD ACID/GEL Batteries. We have also mentioned the compatible vehicles in the Additional Information section of the product. You can also use the Compatible Electric Vehicles filter to find which battery will fit in your model of vehicle.

Q. Once I have booked an order by paying the deposit amount do I need to pay the rest amount immediately or before receiving materials. ?

A. No, We have the option of COD once you have booked the order.

Q. Do I have to make full payment to purchase a product?

A. No, For orders above Rs 10,000 an option of deposit is enabled which you can select by clicking on the product and then clicking on the Deposit Option.

Q. I am unable to find the product I need? Or I don’t know which battery I should buy?

A. Click on the category – eg. “2 Wheelers” or “Wheelers” or EV Chargers”. Then you can use the filters provided in each category to match your requirement.

For eg. 

1. You can enter the mileage you want to filter the batteries. 

2. You can enter the voltage or if you don’t know the voltage you can chose how many 12V Lead Acid Batteries you have currently in your Vehicle. 

The filters automatically select the best option for your vehicle.

Q. I want to order on Cash on Delivery. What should I do?

A. Yes, SUMATOTEK provides a home delivery service with Cash on Delivery options. But keep in mind that Cash on Delivery orders are accepted only after you pay a deposit amount. The minimum deposit amount is mentioned on all items. After paying the deposit amount by UPI/Wallet/Card/Direct Bank Transfer you can pay the pending amount as Cash on Delivery. Also, note EMI options are unavailable for deposit amounts.

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