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    65 w adapter on 9 cell battery ?

    Discussion in 'HP' started by greendesert, Jul 15, 2011.

  1. greendesert

    greendesert Notebook Enthusiast

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    I bought a dv7 laptop with 9 cell battery. I ordered thru HP.com and saw the power adapter listed as 120w.

    Instead I got a 65w and it gets hot when recharging battery. I contacted HP support chat twice and was told this adapter is compatible with the laptop.

    I do have a new HP 90w adapter lying - can I use it ?


    thanks
     
    greendesert, Jul 15, 2011
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  2. MidnightSun

    MidnightSun Emodicon

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    The number of cells of the battery do not dictate the required wattage of the AC adapter. Take a closer look at your HP.com receipt, though: are you sure it says "120W," or does it actually say "120V" (the standard voltage used in the U.S.)? If your dv7 has integrated graphics, chances are, the 65W adapter is compatible.

    If the current/voltage specs of the 90W brick you have match, and the plugs match, there's a good chance it'll work.
     
    MidnightSun, Jul 15, 2011
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  3. jiggawhat

    jiggawhat Notebook Evangelist

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    Pretty much every battery adapter will get hot when charging.
     
    jiggawhat, Jul 15, 2011
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  4. greendesert

    greendesert Notebook Enthusiast

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    I have two adapters :

    the 65w brick has output - 18.5 v and 3.5A

    90w has - 19v 4.7A

    Can I use the 90w one ?
     
    greendesert, Jul 15, 2011
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  5. yycools

    yycools Notebook Enthusiast

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    The lower voltage and amp from the 65w adapter will charge the laptop slower, but will supply enough juice to run&charge the laptop at the same time, so long you only use the IGP. I've been using a 65w dell adapter on my dv6tqe for a month now with no problems.
     
    yycools, Jul 15, 2011
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  6. greendesert

    greendesert Notebook Enthusiast

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    Is there something like over voltage charge which can ruin something in the laptop ? if I use 90w has - 19v 4.7A adapter. I understand it will charge the laptop faster and maybe stay a bit cool compared to 65w ?
     
    greendesert, Jul 16, 2011
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  7. Izagaia

    Izagaia Notebook Evangelist

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    If you are talking about potentially ruining a new notebook, why not just alleviate the possibility of risk altogether and just use what the manufacturer recommends, in the first place - a 120w adapter?

    A 90w is compatible. But nothing more. It will charge the notebook battery and run it just fine provided that you do not do anything too stressful, GPU-wise. Which is primarily why HP paired 120w powersupply with the laptop. The discrete GPU requires a 120w powersource for full functionality.

    You bought or are buying a great notebook PC. Don't cheap-out now.
     
    Izagaia, Jul 16, 2011
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  8. Th3_uN1Qu3

    Th3_uN1Qu3 Notebook Deity

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    The 90W adapter is compatible and a better choice. The half a volt difference doesn't matter... Actually, even if it were 20 volts instead of 18.5 it wouldn't have mattered either, as the mosfets in the dc/dc converters inside the laptop are all spec'd to 30 volts (it's the standard).
     
    Th3_uN1Qu3, Jul 22, 2011
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