NinjaBatt Pro Battery for Asus A41-X550A A41-X550 R510C X550C X550L X550J R510L X550CA X552E X550V K550L F550V X550A P550C X550EA X550D R510 X550VX F550C - Premium Cells [4 Cells/2600mAh/38Wh]
A41-X550A Genuine Battery for Asus X450 X450CA X550 X550C F550 A550 X450E 44Wh | eBay
New 8 Cell X550A Battery A41-X550A For Asus X550CA X550CC X550V X550 X550B X550C - Newegg.com
Synergy Digital Laptop Battery, Compatible with Asus F550 Laptop, (Li-ion, 14.4V, 4400mAh) Ultra High Capacity, Replacement for Asus A41-X550, A41-X550A Battery - Walmart.com