21700 Rechargeable Battery Specifications:

  • Nominal Capacity: 5000 mAh 
  • Nominal Voltage: 3.6V / 3.7V
  • Low Discharge Voltage Limit: 2.5V
  • Max Continuous Discharging Current: 10A
  • Dimensions: 74.8mm x 21.49mm (+/- 0.3mm)
  • Weight (max): 70g
  • Positive Terminal: Welded Button Top
  • Protected: Yes, Advanced (welded) Electronic Protection
  • Recommended charging current: 1A - 2A
  • Charging Algorithm: CC/CV
  • Type / Size: 21700 Protected
  • Chemical Composition: Li-ion (Lithium-Ion) Hybrid / High Drain

This Powerful Protected 21700 battery is the best choice for high-performance LED Flashlights. 

It can be utilized with any application able to run on Protected button top 21700 size batteries / 74.8mm x 21.49mm (+/- 0.3mm).


Overcharge (Activated at 4.35V)
Over-discharge (Activated at 2.4V-2.5V)
Over-current (Activated at 10A-12A)
Dual Short circuit protection.

How long does a 21700 battery last?

  • Li-ion battery life expectancy: on average 21700 battery will last 3-6 Years
  • Number of charge/discharge cycles: between 300 and 500 cycles

21700 rechargeable battery will last much longer if it is not under harsh environments/extreme conditions (some of them are):

  • High Humidity
  • High Temperatures
  • High Constant Current Load

***Please note, price is listed for ONE 21700 battery. 

Customer Reviews

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Trustfire (21700) 5000 mAh 3.7V 18.5WH Li-Ion Rechargeable battery

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