This is a high-performance replacement SLA battery for the Brooks Equipment GSB6-5, guaranteed to meet or exceed the OEM specifications of your original. The sla battery is 5.3 x 2 x 3 inches with an output of 6 volts. The chemistry is SLA at 5000mAH capacity. Manufactured by Empire Scientific, model number NP5-6. 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.