SIKER&reg; NC6100- 9 cells Replacement Laptop Battery For Hp Compaq Business Notebook NC6220 NC6320 NC6400 6510b 6715b 6710p 6910p P/N's: 418867-001 364602-001 365750-001 372772-001 398854-001 HSTNN-C12C (7800mAh) --12 Months Warranty