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Thread: External Battery Pack for laptop

  1. #1
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    Default External Battery Pack for laptop

    Basically I have an old laptop sitting around. A compaq v4000 with a dead hard drive. I was thinking on something to do with it. Getting a new hard drive is part of the plan.

    Plan is:

    Build External Battery Pack
    -Lasting for days?
    -Pretty much limitless size
    -Same with weight

    Anyways I have been looking and thinking about this for a while though. I am no electronics major though so I need some help.

    The AC charger has the transformer box that takes 125v AC and turns it into 18.5v DC. Now if I just feed that box 18.5V+ DC will it still work?

    I was thinking on taking about 30 "D" sized rechargeable batteries and wiring them up in a series to give this voltage. These batteries are rated at about 850maH per battery giving me, 25500 maH or 25.5AH.

    Now the battery that is included it 4.4AH, which according to brand new specs, should last in the area of 3 hours (with screen on and use)

    So this should in essence give me 6ish times the battery life. Leaving me at 18 hours. (with use)

    Now if I had any idea on what the battery life was with no screen and little use, I would be much happier, but I don't and I guess I will just have to find out when I build.

    So if I take these batteries would it be better to take them all and run them in series giving me somewhere in the area of 90V+ and letting the transformer take the work of dropping the voltage. Or should I run them in series half and half giving me about 40v? Or should I do something completely different?


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