Samsung 40T 21700 3950mAh battery

Samsung 40T 21700 3950mAh battery

Product no.: B63-40

In stock


Delivery restrictions apply – please see the product description for details


Samsung 40T 21700 3950mAh battery


Featuring a flat top and a 25amp discharge rating, this battery is ideal for use with most regulated devices.
​Supplied in a protective case.


  • Nominal Voltage : 3.7V
  • Capacity : 3950mAh
  • Lowest Discharge Voltage : 2.50V
  • Standard Charge : CC/CV (0.5A-4A max)
  • Charging Cycles : > 500 cycles
  • Max. continuous discharge rate : 25A
  • Operating Discharge Temperature : -20 - 60 Degree Celsius
  • Dimensions: 21.1mm x 70.2mm 

Attention: These cells have much lower internal resistance than regular LiIon 3.7V cells and they may end up with a higher ending voltage when charged in some chargers. Please check the voltage of them using a volt meter right out of the charger to see if they are above 4.20V when fully charged with your charger. Overcharging above 4.25V may shorten life/cycles. Above 4.50V may even pop them or making them vent. DO NOT use the charger if it seems to overcharge IMR cells. They should never be discharged below 2.5 volts or cycle life/performance will be reduced.


Please read Lithium battery safety information before charging/using lithium batteries.

This product is only offered for sale within the UK due to shipping restrictions.


Additional product information

Safety Information Download


Product Note Status Price
Dual 21700 Battery Case Dual 21700 Battery Case
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