Tech Rover Asus M50 trade; Max-Life Series 9-Cell [High-Capacity] Replacement 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, 6600-7800 mAh, Effective Capacity All Tech Rover&trade; branded items carry a 1 year warranty against manufacturer defects. *Please note this is an extended-capacity battery with longer battery life and may protrude slightly from your laptop. Some Asus laptops will not allow the screen to open when using a 9-Cell battery.