Integrated microchip prevents overcharging & lengthens battery life / Up to 6 hours talk time, 250 hours standby / 3.7V Voltage / 950 mAh Capacity This BL5F Li-ion 950 mAh Battery provides power in a thin, compact, and lightweight package. It lets you keep talking, making sure you dont miss important phone calls. Simply swap out with your original battery when you run low on power. The BL5F Lithium ion (Li-Ion) Batteries keep your phone powered up when you need it most.