CWK New Replacement Laptop Notebook Battery for Toshiba PA3634U-1BAS PA3635U-1BAM PA3635U-1BRM PA3636U-1BAL PA3728U-1BR PA3634U-1BRS PABAS116 PABAS228 Toshiba Satellite C645-SP4011L C645-SP4131A 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!