Specifications: Capacity: 4400 / 6600mAh Chemistry: Li-ion Voltage: 10.8V / 11.1V Cell: 6 / 9 cell Compatible Models: HP Compaq Business NoteBook 6500b, 6530b, 6535b, 6700b, 6730b, 6735b, 6736b, 6930p EliteBook 6930p, 8440b, 8440p, 8440w, 8530wt ProBook 6440b, 6445, 6445b, 6450, 6450b, 6455b, 6535b, 6540, 6540b, 6545b, 6550b, 6555, 6555b Please carefully check your battery's Compatible Model & battery picture to ensure compatibility with your Laptop. What's in the box 1 x Replacement Laptop Battery