This is a high-performance replacement video battery for the Sears 58857, guaranteed to meet or exceed the OEM specifications of your original. The video battery is 3.52 x 1.81 x 0.74 inches with an output of 6 volts. The chemistry is NiMH at 2100mAH capacity. Manufactured by Empire Scientific, model number BNH-109-2.1. 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.