Nokia BL-5C is rated at 850 mAh. Li-Ion batteries provide superior talk and standby times, but weigh up to 30% less than comparable Nickel Metal Hydride batteries. Li-Ion batteries can also be recharged at any time without suffering memory effect, a condition that can sap a battery`s performance over time. Talk Time: up to 2 - 4 h Standby Time: up to 150-200 h Charging Time: 1 h 35 min Actual talk and standby time vary depending on personal usage and system transition of your service provider. Important: New Lithium Ion batteries must be FULLY CHARGED and FULLY DISCHARGED 2 to 3 times, before being FULLY CONDITIONED. Please remember that a new Lithium-Ion battery`s full performance and longevity is only achieved after 2 to 3 complete charge and discharge cycles. After you go through 2 to 3 cycles, you`ll never have to condition your battery again! Compatiblility: Nokia 6820, 3660, 3650, 3620, 3600, 3100, 2285, 2270 and 1100