New Laptop/Notebook Li-ION Battery for Acer Aspire 4551 4551-2615 4551G 4741 4741G 4771 4771G 5250 5251 5252 5253 5253G 5333 5336 5560G 5733 5736Z 5741 5741G 5741Z 5741ZG 5742 5742G 5742Z 5750 7741 7741G 7741Z 7741Z-5731 100% brand new and high quality. Li-ion Replacement battery 11.1V/5200MAH,6cell