Lenovo Part
04X3736
is compatible in the following Models:
Lenovo ThinkPad W Series laptops
ThinkPad W520 - 4270CTO
ThinkPad W520 - 4282CTO
ThinkPad W520 - 4282PS3
ThinkPad W520 - 4284A48
ThinkPad W520 - 4284DU4
ThinkPad W520 - 4284HL9