ARB-L14-1600U Built-in USB Rechargeable BatteryMicro-USB charging port1600mAh high capacityProtection circuitry to prevent short circuitsPressure vents to prevent explosions500 charge cycles guaranteed before 75% decrease by memory effectVoltage: 1.5VCharging Current: Only charge using aUSB cable to the micro USB port on the battery. Do not charge by other deviceCharging Current USB Port: 300mAWeight: 19gSize: Length: 50mmDiameter: 14.5mm