When you get the charger, see the right arrow cover, push it to the right, insert the battery into the charger, use the first and second pins as shown in the figure, the indicator light of the charger turns green, and you can see the battery power percent . Open the folding 2-pin charging head at the back to charge. Intelligent dedicated battery charger with USB output. * When the battery is fully charged, automatically stop charging. * Safety cut out circuit, Built-in protection circuit prevents overcharging. * Constant current, constant voltage charging, automatic identification. * Input : AC 100-240V 50/60Hz 0.15A * Output : DC 4.2, 350mA /-50mA,USB Port output: DC5.2V, 800mA(USB) * Generic Best replacement for battery with comparable standby and talk time. * DirectlyGreat bargain, Huge discounts, High cost-effective. * Integrated microchip inside prevents overcharging and lengthens battery life. * Pass safe test in factory, quality guarantee,1 year warranty. * Battery Type: Lithium Ion * Battery Capacity: 1500mah * Voltage: 3.7v * Battery size: 6.5*4.3*0.5 Compatible with models: For Nokia BP-4L -- For Nokia E52,E55,E61i,E63 -- For Nokia E71,E71i,E71x,E72,E73, E73 Mode -- For Nokia N810,N810 Internet Tablet,N97 -- For Nokia E90 Communicator,E90i,E95 -- For Nokia Surge 6790,For Nokia 6760 slide -- For Nokia 6650 Fold,6650T,6650F