What is the difference between BR-5C and BL-5C battery? Why does Nokia start to install BR-5C instead of BL-5C? My Phone is Nokia 3100. On site nokia.ru is written, that "Standby Up to 170-410 hours (7-17 days)". My phone works just 3-4 days on standby. My battery is BR-5C, signal strength of the cellular network is maximum. Can anybody help me.