MACKTECH AA-PBYN8AB NP530U4B NP530U4B-A01US NP530U4B-A02UK NP530U4B-S01PL NP530U4B-S03CN NP5304B-S03PH 530U4B-A01UK 530U4B-A02US 530U4B-A03 530U4C 535U4C Series BA43-00339A 7.4V 45Wh 4 Cell Laptop Battery