DR. BATTERY Professional Series Replacement Notebook Battery: Dr. Battery Professional Series battery is made of quality materials, top grade battery cells to bring your laptop back to life and maintain your laptop service time. Safety First Criteria: All of Dr. Battery Professional Series batteries have short circuit, overheat, and overload protections to maintain the safety of usage. Condition: New Cell Type: Lithium-Ion Device Voltage: 11.1V Capacity: 4400mAh / 49Wh Warranty: 1 Year Compatible Models and Original Battery Part Number: AS09A31, AS09A36, AS09A41, AS09A51, Acer Aspire 4732, 4732Z, 5241, 5334, 5516, 5517, 5532, 5541, eMachines D520, D525, D725, E430, E525, E527 ** In prevent from purchasing incorrect battery, please compare with your original battery & check the Compatibility at [Specs] below.