Samsung 25r 18650 Battery
Nominal Capcity: 2500 mAh
Nominal Voltage: 3.6V
Discharge End Voltage: 2.5V
Standard Charging Current: 1.25A
Charging Voltage: 4.20+-0.05V
Max. Continuous Discharging Current: 20A
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 18650 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.