This is a high-performance replacement vacuum battery for the KARCHER CS588, guaranteed to meet or exceed the OEM specifications of your original. The vacuum battery is 2.95 x 1.96 x 1.53 inches with an output of 6 volts. The chemistry is NIMH at 2100mAH capacity. Manufactured by Empire Scientific, model number VNH-112. 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.