Amazon.com: BZBYCZH CMOS RTC Battery Compatible for HP COMPAQ Business Notebook 6730s CMOS BIOS RTC Battery : Electronics
Premium Power Products Compatible 8 cell 4400 mAh battery for HP 6730s 6830s For Notebook Battery Rechargeable 4400 mAh 48 Wh 14.4 V DC 1 - Office Depot
New Battery for HP Compaq 550 610 6720s/CT 6730s 6735s 6820s 6830s HSTNN-LB52 | eBay
HP DD06 Original Laptop Notebook Battery 6Cell 10.8v, 47wh, 4200mAh, 4 – grassroots-computers