Amazon.com: Replacement Keyboard for HP Compaq 540 550 6520 6520S 6720 6720S Series Black US Layout, Compatible with Part# 456624-001 455264-001 : Electronics
HSTNN-I40C - 6-Cell Battery for HP Compaq 510 550 610 6720 6720s 6730s 6735s 6820s - CPU Medics
Renewed) HP Intel Core Duo 15.6-Inch (39.62 cms) 720p HD Ready Laptop (2 GB/160 GB/Windows/INTEGRATED/Black/2.10 Kg), HP COMPAQ 6720S : Amazon.in: Computers & Accessories
Amazon.com: Original Laptop Charger Power Adapter 18.5V 3.5A 4.81.7mm 65W Compatible for HP Compaq 6720s 500 510 520 530 540 550 620 625 G3000 with US Cable : Electronics
Amazon.com: 90W 19V 4.74A Power Cord Laptop Charger for HP ProBook Pavilion G7 G6 G4 G60 G50 DV7 DV6 DV5 DV4 for HP Pavilion All in one Computer Desktop PC 18'' 19''