Replacement Li-Ion Battery for Nokia 6102i / 2650 / 5100 / 6100 / 6101 / 6170/ 6260 / 6300/ 7200 / 7270 BL-4C High quality generic (non-OEM) Lithium Ion battery for Nokia. Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH). Integrated microchip prevents overcharging &amp; lengthens battery life. Best replacement for the original battery (BL-4C) with comparable standby and talk time. Great bargain with excellent quality guaranteed!signal (distance between the phone and the base station) The operation time of the battery depends on conditions such as: transmitting power level, signal (distance between the phone and the base station), network parameters defined by the operator, phone features used, battery age &amp; condition, charging habits, temperatures battery exposed, digital/analog mode, amount of time on standby and actual talktime, etc.