Asus X53S Series (2011 Model) SUPERIOR GRADE Tech Rover brand 6-Cell Battery 100% Compatible - Will not void your original laptop warranty Tech Rover&trade; Quality product with 30-DAY Worry-Free Return Policy Brand New Battery, 4400-5200 mAh, Effective Capacity All Tech Rover&trade; branded items carry a 1 year warranty against manufacturer defects. 6-Cell High Throughput Battery