This is a high-performance replacement tablet battery for the Apple MD511LL, guaranteed to meet or exceed the OEM specifications of your original. The tablet battery is 4.93 x 7.86 x 0.2 inches with an output of 3.7 volts. The chemistry is LI-POL at 11500mAH capacity. Manufactured by Empire Scientific, model number TLP-009. 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.