GFI Brand 5200mAh High Performance Laptop Battery for Acer Aspire 4253 4551 4552 4738 4741 4750 4771 5251 5253 5336 5552 5733Z 5750 7750G and Acer TravelMate 4740 4740G 5735 5735Z 5740 5740G- 12 Months Warranty Battery type: Li-ion; Capacity: 5200mAh/58WH; Cells: 6-cell; Voltage: 11.1V; 100% brand new from manufacturer. Under 100% Aging Test. Up to 500 cycles life, low self-discharge, no memory effect; Dual IC chips provide protection against short circuit, over-discharge, overcurrent. CE/FCC/RoHS certified for product safety. 24/7 email support, 12-month hassle-free warranty. Grade A Cell ensures fast charging and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time for standard batteries(6-Cell, 4400mAh): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.