... for nokia mobile phoneBrand NameRIGModel No.BL-4BColorBlack and whiteBattery TypeLi-ionCondition100% newStandard Voltage3.7VNominal Capacity820mAh(Available more capacity batteries ... not overcharge or overdischarge batteries .It will decrease the batteries’s service lifeShenzhen Rigao Technology ... board,mobile phone batteries,digital batteries, MPFor more information about our batteries, pls feel free ...