This is a high-performance replacement cellular battery for the Apple IPHONE 4 16GB, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 3.2 x 1.31 x 0.17 inches with an output of 3.7 volts. The chemistry is LI-POL at 1400mAH capacity. Manufactured by Empire Scientific, model number BLP-1275-1.4. 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.