Replacement Battery for iPhone 4S - Compatible with A1387 CDMA & GSM Models Battery for iPhone 4s (TOOLS NOT INCLUDED) 3.7V 1430mAh, Model A1387 (check on the Back of your iPhone) Compatible APN's: 616-0579, 616-0580, 616-0581 Doesn't fit iPhone 4 or iPhone 4g New 3.82V 1810 mAh Li-ion