ATC 6-Cell 5200mAh New Replacement Laptop Battery for TOSHIBA PA3634U-1BAS PA3635U-1BAM PA3635U-1BRM PA3636U-1BAL PA3636U-1BRL PABAS117 PABAS118 PA3638U-1BAP PA3816U-1BAS PA3816U-1BRS PA3817U-1BAS PA3817U-1BRS PA3818U-1BRS PABAS227 PABAS228 100% Compatible - Will not void your original warranty Tech Rover&trade; Quality product with 30-DAY Worry-Free Return Policy Brand New High output Battery All Tech Rover&trade; branded items carry a 1 year warranty against manufacturer defects.