Which ebay laptop battery should I get? 2 links provided

Please help me pick a battery. I'm confused why the the first one is cheaper, because it has better specs: lasts longer (more mah), and is lighter and smaller. Maybe newer technology?
$37.50 12 cells 7800 mah
http://www.ebay.com/itm/12-cell-battery-HP-8710p-8710w-EJ092AA-HSTNN-OB06-/110700158021?pt=Laptop_Batteries&hash=item19c63e5c45

The second one is heavier, so maybe it's better quality? And it has "new" in the title, whereas the first only has "new" listed as the item condition.
$57.99 12 cells 6600 mah
http://www.ebay.com/itm/new-12-cell-battery-HP-NC6220-nc6230-nc6320-nc6400-/130417498584?pt=Laptop_Batteries&hash=item1e5d7d19d8
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More about which ebay laptop battery links provided
  1. Whats the model of your laptop? Those two batteries have completely different compatibility lists, and different spares #'s
  2. NC6400, which on a spec webpage (http://h18000.www1.hp.com/products/quickspecs/12446_na/12446_na.HTML) has battery ej092aa listed as compatible, which both listings contain.

    The NX models in the first listing are a similar line of laptops to the NC.
  3. That is a good point though. Maybe the first listing wouldve also listed the NC models if they were compatible.

    I did notice the NWs and NXs used Pentrium M's, while the NCs use Core 2 duo CPUs, and NC is not in the first linging. Wonder if that has something to do with it. Still, the first listing did list ej092aa.
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