This is a high-performance replacement two-way battery for the Sokkia TOTAL STATIONS 230R, guaranteed to meet or exceed the OEM specifications of your original. The two-way battery is 1.52 x 2.79 x 0.79 inches with an output of 7.2 volts. The chemistry is Li-Ion at 1900mAH capacity. Manufactured by Empire Scientific, model number BLI-SOK1. 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.