This is a high-performance replacement cellular battery for the Samsung SGH-T999V, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 2.48 x 1.98 x 0.221 inches with an output of 3.8 volts. The chemistry is LI-ION at 2100mAH capacity. Manufactured by Empire Scientific, model number BLI-1258-2.1. 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.