Asus S550CA High Output battery for Ultrabook laptops Flush-Fit 100% Compatible - Will not void your original laptop warranty Tech Rover&trade; Quality product with 30-DAY Worry-Free Return Policy 14.4V Brand New Battery 2600 mAh, 4-Cell High Output Battery All Tech Rover&trade; branded items carry a 1 year warranty against manufacturer defects. Compatible Part Numbers: A31-K56, A32-K56, A41-K56, A42-K56, A46, A56, E56, K56, P46, P56, Pro4Q, Pro5T, R405, R505, R550, S40, S46, S50, S550, S56, U48, U58, V550, V550C, V550CA, V550CB, V550CM