The Stalion Strength Replacement Battery for iPhone 4S is a great replacement for internal batteries that have been over charged or dying battery cells. It will work with models – 616-0579, 616-0580, 616-0581, A1387 (AT&T, Verizon, Sprint) and A1431 (International Versions).
With a battery capacity of 1430mAh, this Lithium Ion replacement battery for iPhone 4S has voltage of 3.7V and duration of 5.25Wh, and it is CE and ROHS certified. The tools needed for the replacement do not come with this kit and need to be bough separately. They may also require a slight amount of technical sills. It comes with a 24-month warranty from Stalion.