... 3.CE,RoHS Certificate 4.1year warranty cheap cell phone batteries (BL-4U,BL 4U, BL4U) Compatible ... Transmitting power level, Signal (distance between the phone and the base station), Network parameters defined by ... out with little or no power, so please charge it for about 3 - 4 hours before ... batteries and Li-ion battery protection board,mobile phone batteries,digital batteries, MP3,MP4 batteries,Polymer ...