LENMAR Replacement Battery for Acer Aspire 5251 Laptop Computers (LBZ366AC) Fits: Acer Aspire 5251 Replaces: Acer AS10D31, AS10D3E, AS10D41, AS10D61, AS10D71, BT.00606.008, AS10H31 11.1V / 4400mAh Lithium Ion 1 Year Warranty