This is a high-performance replacement laptop battery for the Toshiba Satellite A20-S2591, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 8.12 x 3.58 x 0.83 inches with an output of 10.8 volts. The chemistry is Li-Ion at 8800mAH capacity. Manufactured by Empire Scientific, model number LTLI-9077-8.8. 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.