Samsung 40T 21700 Battery INR21700-40T Flat Top

Minimum Purchase:
2 units
  • Samsung 40T 21700 35A battery Li-ion
  • Samsung 40T Case included when batteries are purchased in pairs
  • 21700 battery Samsung 40T 35A battery Li-ion

Temporarily Unavailable


New, and very powerful 21700 battery from Samsung:

Samsung 40T 21700 35A Battery INR21700-40T Flat Top

Free 21700 Battery Case is included when batteries are bought in quantities of 2 or multiples of 2. (Example 2, 4, 6, 8, 10, etc.)



  • Capacity: 4000 mAh
  • Nominal Voltage: 3.6V/3.7
  • Low Discharge Voltage Limit: 2.5V
  • Max Continuous Discharging Current (Without temperature cut): 35A
  • Max Continuous Discharging Current (With 80℃ temperature cut): 45A
  • Dimensions: 70.3mm max x 21.22mm max
  • Weight: 67g
  • Positive Terminal: Flat Top
  • Protected: No

Highly recommended 21700 Li-ion charger for this powerful hybrid IMR battery is:


You must carefully read, and comply with the safety instructions and precautions in this: Safety Instructions guide before charging, using your battery.

Failure to read, and follow Li-ion safety instructions, and warnings may result in fire, personal injury, and property damages if the battery is charged and/or used improperly.



    • DO NOT SHORT CIRCUIT. Short circuits may cause a fire and injury!

    • Charge battery fully to 4.2V before first use.

    • Use high-quality charger specifically designed to charge Li-ion batteries.

    • Do not charge unattended.

    • Always keep your battery that is not in use inside plastic battery holder.

    • Do not keep a bare battery in your pocket, purse, or anywhere together with other metal (conductive) objects.

    • Never attach any metal moving part |magnet| to the top positive or the bottom negative battery contact.


    • Stop using the battery with damaged PVC tube (wrap) or terminal insulator immediately.

    • If the battery is damaged in any way stop using it immediately.

    • Never discharge a Li-ion battery at a rate exceeding the maximum discharge current specified for that battery.

    • Never use force to install (insert) Li-ion battery.

    • Do not use old, and new batteries together.

    • Do not solder directly onto the battery.

    • Do not immerse in any liquid.

    • Do not drop the battery. Always keep it in a plastic protective holder.

    • Do not place the battery in high-pressure containers, microwave ovens, or on induction cookware.

    • Immediately discontinue use of the battery if, while using, charging or storing the battery, the battery emits an unusual smell, feels hot, changes color or shape, or appears abnormal in any other way.

    • Do not carry, or store the batteries together with hairpins, necklaces, or other conductive metal objects.

    • Use only high-quality battery Li-ion charger (CC/CV 4.2V max).

    • Do not expose to heat.

    • Do not disassemble, or modify the battery.

    • Keep the battery away from children, and pets.

    • Never charge, or store the batteries inside your car in extreme temperature. Extreme temperatures (low or high) might ignite the battery, and cause a fire.

    • Do not short (connect) positive, and negative battery terminals (contacts) intentionally, or unintentionally.

    • Never charge the battery over 4.25V (properly charged li-ion battery is 4.2 Volts / full charge).

    • Do not reverse the positive (+) and negative (-) terminals when charging, or using the battery.

    • Never charge the battery at a current exceeding manufacturer-specified charging current.

    • Do not expose the battery to water or salt water, or allow the battery to get wet.

    • You must verify polarity before connecting the battery to the host device (or charger).

    • Never completely discharge the Li-ion battery ( below 2.5V under load ).

    • After the battery is discharged-don't leave it discharged-charge battery as soon as possible (10 min. rest time).

    • It is your responsibility to determine that your charger and host device works properly.

    • On (battery electrolytes) exposure to skin, flush with water immediately.

    • If eye exposure occurs, flush with water for 15 minutes, and seek emergency care immediately.

    What is short circuit?

    The situation when battery positive (+) and negative (-) connect. The current will become extremely high because there is no resistance in the path to limit current flow. This Short circuit will result in dangerously high temperature which may cause a fire.



What is in the box?

  • Samsung 21700 INR21700-40T 35A rechargeable battery cell flat top
  • Safe Li-ion packaging.
  • Free battery case with each pair of batteries.

Price listed is for one battery cell.

We ship from Florida -USA.

ONE Samsung 40T for sale. 

There are two heatshrink/tube/skin/wrapper color variations under the same Samsung part number INR21700-40T: Purple and Gray

One (2x21700) battery case / holder included with each pair of batteries. 


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