This is a high-performance replacement cellular battery for the Apple IPHONE 5S, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 3.56 x 1.3 x 0.148 inches with an output of 3.8 volts. The chemistry is LI-POL at 1570mAH capacity. Manufactured by Empire Scientific, model number BLP-1279-1.6. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.