X550A Battery A41-X550A for Asus X550 X550B X550C X550CA X550CC X550V CG - Newegg.com
Synergy Digital Laptop Battery, Compatible with Asus K550LA Laptop, (Li-ion, 14.4V, 4400mAh) Ultra High Capacity, Replacement for Asus A41-X550, A41-X550A Battery - Walmart.com