This is a high-performance replacement vacuum battery for the Dyson DC16 ROOT 6, guaranteed to meet or exceed the OEM specifications of your original. The vacuum battery is 4.96 x 2.92 x 0.98 inches with an output of 21.6 volts. The chemistry is LI-ION at 1500mAH capacity. Manufactured by Empire Scientific, model number VLI-104. 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.