This is a high-performance replacement laptop battery for the Apple MA561LL/A, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 8.3 x 3.04 x 0.58 inches with an output of 10.8 volts. The chemistry is Li-Ion at 5400mAH capacity. Manufactured by Empire Scientific, model number LTLP-9071-5.4. 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.