Laptop battery 42T4795 for Lenovo ThinkPad T410 T420 T510
Lenovo ThinkPad W520 Battery Replacement
Decided it was time to replace my big, bulky, battery hungry W520, as it was starting to fail on me. So, I decided to get a smaller, but loved ThinkPad X230. :
Battery for Lenovo ThinkPad W520 4281,replacement Lenovo ThinkPad W520 4281 laptop battery from Singapore(4400mAh,6 cells)
Lenovo IBM ThinkPad W520 Extended Life Replacement Battery