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: 10.8V Capacity: 4400mAh / 48Wh Warranty: 1 Year Compatible Models and Original Battery Part Number: A45, A55, A75, F45, F75A, F75A, K45, K55, K75, K75A, R400, R500, R700, U57, X75, Q500 Series: A32-K55, A32-K55X, A33-K55, A41-K55 ** In prevent from purchasing incorrect battery, please compare with your original battery & check the Compatibility at [Specs] below.