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HP Recommended

9 cell 100Wh primary and secondary battery source for EliteBook 8470p

EliteBook 8470p
Microsoft Windows 10 (64-bit)

I recently ordered a EliteBook 8470p from eBay and it came with a "brand new" 55Wh 6 cell battery (HWiNFO64 says 0.0% wear) and its ok for light use (maybe 2 hours on max power saving mode) but not for the way I would like to use it (at least 6 hours on balanced). I ordered a ST09 secondary battery from eBay and it was a genuine hp battery however all the cells where puffed up so its no good despite the seller saying they test them. Looking through the product details i see that there is a 9 cell 100Wh primary battery and 9 cell 100Wh secondary battery option for this model and I'm having a hard time finding a source to get those from a reputable seller even if they are used. Any help will be appreciated.

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