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Thread: How To Charge Cordless Drill Battery Without Charger

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    Supporting Member HandmadeCreativeChannel's Avatar
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    Thumbs up How To Charge Cordless Drill Battery Without Charger


    Hello Friends. In this video i show the best way to charge a cordless drill battery if you lost the charger or the charger is broken. Using cheap Dc POwer Suplly with volt controller from 9 to 24,5 volt. Thanks for watching

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    jdurand's Tools
    Note that NiCd and Nmh batteries are fairly easy and tolerant in charging. Lithium batteries are most definitely not easy and tolerant.

    If doing lithium, you'll need a processor with a calibrated voltage measuring capability. Arduino would work if you make sure to calibrate it.

    Next you need a current limited power supply. The current has to be less than the capacity of the cell, half the capacity is very safe.

    The voltage has to be limited by cell number and type. A typical 3.7V lithium polymer cell has a limit of 4.2 V. Many people use the (hopefully) built-in protection circuit to limit the voltage...that's not the smartest thing you could do.

    So, my programming steps...

    top:
    if battery voltage over 3.7V, go to top

    // continue here

    reset and pause timer

    charge:
    if timer > 1 hour, turn off charge and go to top
    if battery below 4.1V, turn on charge and continue timer
    if battery above 4.15V, turn off charge and pause timer
    go to charge

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    Thanks HandmadeCreativeChannel! We've added your Cordless Battery Charging Method to our Chargers category,
    as well as to your builder page: HandmadeCreativeChannel's Homemade Tools. Your receipt:





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