Tech Rover Acer One UM08B71 trade; Max-Life Series 12-Cell [Super-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, 8800-10400 mAh, Effective Capacity All Tech Rover&trade; branded items carry a 1 year warranty against manufacturer defects. 12-Cell High Throughput Battery *Please note this is a high-capacity battery and may protrude slightly from your laptop