Klarus 21GT-50 INR 21700 5000mAh 15A High-Drain Rechargeable Lithium Battery


Klarus comes out with some of the most power-packed cells on the market, and their first ever 21700 sized cell is no exception. The Klarus 21GT-50 is only larger than an 18650, but boasts nearly double the power at most with an impressive 5000mAh capacity. The 15A drain will take care of most high-drain devices, and can charge back up to 100% over 500 times within 2 hours. The built-in PTC keeps you and your devices safe against over-charge, over-discharge, over-current, and short-circuit accidents. Klarus recommends this 21700 battery for compatible flashlights, smart locks and powerbanks & battery packs.


  • Brand: Klarus
  • Size: 21700
  • Capacity: 5000mAh
  • Discharge Rating: 15A
  • Nominal Voltage: 3.63V
  • Rated Capacity: 4.90Ah
  • Wh Rating: 17.787Wh
  • Terminal Type: Button Top


  • Length: 75.8mm (2.98")
  • Diameter: 21.7mm (.85")
  • Weight: 72g (2.54oz)

Charging Info

  • Charge Cycles: 75.8mm (2.98")
  • Charging Time (1000mA Current): 5.5 Hours (Max)
  • Charging Time (5000mA Current): 2 Hours (Max)