Best battery for my system

Please help me pick a battery to get the maxmimum amount of time.
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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  1. I wouldn't buy either of these imo. I work with a lot of lenovo machines, and probably 75% of people that come in with 3rd party batteries have some type of issue with them. I would get an actual HP battery and avoid these.

    They also seem to be completely different in that one of these is a slice style battery that attaches to the bottom of your machine, and the other fits in from the back.
  2. thanks for replying.
    Well, it's a battery for a $200 NC6400 laptop, regular price would be over $100.

    And I am also wondering if the first is compatible with NC6400, cause the first listing lists NX and NW models (i think earlier lines than NC with pentrium M processers instead of core 2 duo), but doesnt list NC.

    But the spec page (http://h18000.www1.hp.com/products/quickspecs/12446_na/12446_na.HTML) for NC6400 lists ej092aa as a compatible battery, which both listings mention.
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