Battery Type: Lithium-Ion; Battery Voltage: 3.7V; Battery Capacity: 1240mAh. Kastar LCD USB Triple charger, can charger 3 batteries in the same time. Easy to carry, the Charger Input: 5V 2A 10W; Output: 4.2V 0.5A(x3). Intelligent LCD charger displays charging status and battery capacity. Can be powered by USB Wall & Auto Charger or a Computer, comes with a Micro USB cable.