This is a high-performance replacement cellular battery for the Motorola DROID 4, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 2.75 x 1.89 x 0.151 inches with an output of 3.8 volts. The chemistry is LI-ION at 1785mAH capacity. Manufactured by Empire Scientific, model number BLI-1201-1.8. 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.