Efest 21700 Batteries
Dimensions: 70mm (L) x 21mm (D)
Rated Capacity: 3700mAh
Nominal Voltage: 3.7V
Voltage at end of Discharge: 2.5V
Standard Charge: 2A
Discharging Current: 35A (mooch says 30A)
These cells have much lower internal resistance than regular LiIon 3.6V cells and they may end up with a higher ending voltage when charged in certain chargers. Please check the voltage of your 21700 IMR battery right out of the charger to see if they are above 4.20V when fully charged. You can do this with a Multimeter Overcharging above 4.25V may shorten life/cycles. Above 4.50V may even damage them. DO NOT use the charger if it is overcharging IMR cells.