How to charge: Any number of 1~8 AA/AAA or 1~4 C/D batteries together at a time, Do not need to charge batteries by pairs Features of D Batteries * Quantity: Pack of 4 D Size 10000mAh Ni-MH rechargeable batteries. * Voltage: 1.2V * High performance, up to 1,200 rechargeable cycles. * Excellent charge/discharge performance, the batteries will keep a high quality after 3-5 times charge & discharge when used in the first time or long time no used. * Longer life in the high drain devices than normal Alkaline batteries. * Doesn't contain Hg/Cd/Pb, no pollution to the environment. * Great for high power demand devices such as LED candle, flashlight, ortable CD and MP3 players, digital camera, children' toys and so on. Technical Data: (Charger) * Input: DC 5V /2A * Output : DC 1.2 V 1800 mAh * Weight: 199.5 G Charging Time: 1-8pcs AAA 1100mAh:Typically 0.6h to be fully charged 1-8pcs AA 2000-3000mAh:Typically 1.5 \u2013 1.8h to fully charged 1-4pcs C 4000-5000mAh: Typically 2.2 - 3h to .