This is a high-performance replacement cellular battery for the Nextel I500 PLUS, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 4.09 x 1.22 x 0.59 inches with an output of 4.8 volts. The chemistry is NiMH at 1200mAH capacity. Manufactured by Empire Scientific, model number BNH-675-1.2. 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.