This is a high-performance replacement two-way battery for the Trimble R8, guaranteed to meet or exceed the OEM specifications of your original. The two-way battery is 1.52 x 2.79 x 0.78 inches with an output of 7.4 volts. The chemistry is Li-Ion at 2600mAH capacity. Manufactured by Empire Scientific, model number BLI-TRB3. 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.