This is a high-performance replacement cellular battery for the Nokia BP-4GW, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 2.48 x 2.34 x 0.184 inches with an output of 3.7 volts. The chemistry is LI-ION at 2000mAH capacity. Manufactured by Empire Scientific, model number BLP-1321-2. 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.