CWK High Performance [5200mAh (4400mAh compatible) 58Wh 6Cell] Extended Laptop Notebook Battery for Toshiba PA3817U-1BRS PA3818U-1BRS PA3819U-1BRS Satellite M600 M640 M645 P740 P745 P745D P750 P755 P755D P770 P770D P775 P775D PS300C 24 Months warranty Condition: Brand New - Grade A cells Battery Type: Li-ion Voltage: 10.8 Volt (11.1 Volt compatible) Capacity: 5200mAh (Better than 4400mAh) 90 Day Money Back. Buy with confidence!