HP Compaq 6730s Notebook PC HP Compaq 6735s Notebook PC
Genuine DD06 Battery for HP 6720s 6730s 6735s 6820s 6830s HSTNN-FB51 HSTNN-IB62 | eBay
Amazon.com: BZBYCZH CMOS RTC Battery Compatible for HP COMPAQ Business Notebook 6730s CMOS BIOS RTC Battery : Electronics
eReplacements Premium Power Products 490306-001 - Notebook battery ( extended life ) - 1 x lithium ion 8-cell 4400 mAh - for HP 511, 515, 516, 550, 610, 615, 6730s, 6735s, 6830s (490306-001-ER) at TigerDirect.com
HP Compaq Business Notebook 6780S Laptop Battery by Powerwarehouse - Premium Powerwarehouse Battery 6 Cell - Newegg.com