Compatible Models:( Ctrl + F for fast search ur laptop model)
HP/Compaq

HP 550
Compaq 610
Business Notebook 6720s
Business Notebook 6720s/CT
Business Notebook 6730s
Business Notebook 6730s/CT
Business Notebook 6735s
Business Notebook 6820s
Business Notebook 6830s

Compatible Part Numbers:
HP/Compaq
451086-121,451085-141,451086-161,451568-001,456864-001,GJ655AA,HSTNN-IB51,HSTNN-IB52,HSTNN-IB62,HSTNN-XB51,HSTNN-XB52

If the battery is still not charging fully/being recognized, here is the steps to try: 
1.Turn off the laptop. 
2.Unplug AC power. 
3.Remove the battery. 
4.Replace AC power. 
5.Turn on laptop,allow OS to boot. 
6.Once logged in to the machine,perform a normal shut down. 
7.Unplug AC power. 
8.Replace battery 
9.Turn on laptop,allow OS to boot.

100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. CE/Rohs/FCC-Certified for safety.

Return Policy
1. Warranty and Guarantee terms start from purchase date.We have 1- year warranty.
2. If you received an incorrect, damaged, defective, or item not as described, pls contact us Via Email for a partial/full refund or replacement.