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Thread: Mobile LiIon battery charger

  1. #1
    Unenlightened
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    Question Mobile LiIon battery charger

    so, is it possible to make a mobile charger from some LiIon battery with greater cap, like ~3000mAh (could be lap-top battery or standard e.g. 18650), to charge smaller LiIon 3,7V cylindric batteries, like ~500mAh?
    plz answer, because this will mean a lot to many ppl.

  2. #2
    Flashaholic*
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    Default Re: Mobile LiIon battery charger

    interested to know too..


    and to add little more versatiltity: is it possible to charge a cellphone battery with such an batterypack?
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  3. #3
    Flashaholic* Wrend's Avatar
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    Default Re: Mobile LiIon battery charger

    Yes, of course. The main thing would be to find or make the right charge controller that used the desired input and output voltages.

    Possibly a simple solution would be to find a 12VDC input car charger take it apart and hook that up to 4S LiFePO4 cells.

  4. #4
    *Flashaholic*
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    Default Re: Mobile LiIon battery charger

    You would be limited to the DIFFERENCE between them, as they would tend to equalize.

  5. #5
    Flashaholic* Wrend's Avatar
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    Default Re: Mobile LiIon battery charger

    That's just if you connected them in parallel directly and they were the same chemistry type and cell count in series. They would then balance at the same voltage level. I wouldn't really recommend doing that though, unless you know specifically what you're doing as the rate wouldn't be controlled.

  6. #6
    Flashaholic* AnAppleSnail's Avatar
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    Default Re: Mobile LiIon battery charger

    Quote Originally Posted by just curious View Post
    so, is it possible to make a mobile charger from some LiIon battery with greater cap, like ~3000mAh (could be lap-top battery or standard e.g. 18650), to charge smaller LiIon 3,7V cylindric batteries, like ~500mAh?
    plz answer, because this will mean a lot to many ppl.
    I highly suggest that you use the charging battery as the power input to a Li-Ion battery charger. There are many that are meant to run off 5V. I cannot recommend just damming cells in parallel to charge one, as this can be overly exciting.

    Why will this mean a lot to many people? E-cigs?
    My biggest light-hog is my camera.

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