This is a high-performance replacement laptop battery for the Apple MacBook Pro 17 MA611B/A, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 6.58 x 4.75 x 0.55 inches with an output of 10.8 volts. The chemistry is Li-Ion at 6800mAH capacity. Manufactured by Empire Scientific, model number LTLP-9100-6.8. 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.