Replacement Battery for: Sony NW-S710, NWZ-S600, NWZ-S600F, NWZ-S610, NWZ-S615, NWZ-S615F, NWZ-S616, NWZ-S616F, NWZ-S618, NWZ-S618FBLK, NWZ-S716FRNC, NWZ-S716FSNC, NWZ-S738, NWZ-S738FBNC 100% Compatible with original battery; 180 days warranty Capacity: 750mAh; Nominal Voltage: 3.7V Battery Type: Li-ion Polymer battery; Safe and reliable battery certified by UL, CE, UN38.3, RoHS Over 300 times cycle life; Long working time