Notebook Battery MU-09 replacement 636631-001

[BJB79]

Need a replacement battery for an HP Pavilion dv7-6b78us Entertainment PC.  MU-09 notebook battery. Regulatory model numberHSTNN-IB2W.  11.1V - - 100Wh. 8550mAh.

[Huffer]

HP will not carry it. eBay or Amazon is your best bet. They will have OEM HP batteries but on laptops of that age I actually prefer "compatible" aftermarket batteries as the OEM ones can be new old stock and have sit on the shelf for some time. 

Any of these part numbers would work:

9-cell, 100-WHr, 3.00-AHr, LI 636631-001
6-cell, 62-WHr, 2.80-AHr, LI 593562-001
6-cell, 55-WHr, 2.55-AHr, LI 593554-001

You specified the 9-cell which you understand is swelled out and will lift the back end of the laptop. That is not necessarily a bad thing, BTW as it aids air circulation and cooling and obviously a 9-cell has more runtime than a 6 cell. 

I had some trouble locating a 9-cell. This is a 6-cell but highly rated by buyers:

https://www.amazon.com/DR-BATTERY-593553-001-593554-001-Replacement/dp/B0C386PFBW/ref=sr_1_10?rps=1&...

This is a 9 cell but the price and seller rating give me just a little pause:

https://www.ebay.com/itm/282304803085?itmmeta=01J42MARNAKV6DR3Z3ERCF70NB&hash=item41baad710d:g:T-EAA...