Battery Type: Lithium-Ion; Battery Voltage: 7.4V; Battery Capacity: 3300mAh. Can charge 4 batteries at the same time; Can change the plate to charge different batteries. The Charger Input: 5V 2-3A 15W; Output: 8.4V 800mA (x1 or 2) 500mA (x3 or 4). The Intelligent Compact charger displays charging status and battery capacity. Multiple charging option, Micro-USB input and Type-C input, come with a Type-C cable.