This extended Lithium Ion battery is rated at 1500 mAh. It offer additional talk and standby time with very little sacrifice in size or weight. Lithium Ion phone battery outperforms the equivalent NiMH cell battery, for 30% less weight! Actual talk and standby time vary depending on personal usage and system transition of your service provider. To reach maximum capacity and ensure longetivity of your new battery, you need to charge-discharge it for 3 complete cycles. Ideally, each charge cycle should be more than 10 hours.