The iJoy High Drain Rechargeable Battery comes with a 3750mAh capacity and a 40 Amp max continuous discharge current.  It can be used with most 21700 regulated and unregulated MODS.  Long storage life, light weight and high energy density.   Specifications Brand: iJoy Model: 21700 Size: 21700 21.6mm x 70.5mm Weight: 70 Grams Max Continuous Discharge Current: 40 Amps Typical Capacity: 3750 mAh Nominal Voltage: 3.7 Volts Peak Voltage: 4.2 Volts Minimum Cut..