Nokia BL-4C Li-Ion Battery for Nokia 5100/6100 Phones
Rated at 720 mAH capacity, the Nokia BL-4C is compatible in the following phones: 1006, 2651, 5100, 6100, 6101, 6102, 6102i, 6103, 6126, 6131, 6133, 6300, 6300i, 6301, 6170, 7205, 7270, 7610.  This Nokia battery is brand new and comes in a sealed retail package.  The bl-4c is specially made for the Nokia  cell phone.  Nokia designs and manufactures cell phone batteries to match the specific requirements of their cell phones, satisfying the most demanding customer.  Only trust your phone with Nokia original batteries.  Note that a new lithium ion battery's full performance is only achieved after 2-3 complete charge and discharge cycles.