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Thread: trickle charger

  1. #1

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    trickle charger

    I would like to make up a battery maintainer from a phone charger (have a few from a/c-d/c type).I need a way to automatically shut off.any suggestions?

  2. #2

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    Beri's Tools
    @johncoody,

    Mobile phone chargers usually have output voltages from 3.5 to 5.5V, and all recent phones with a microusb plug are charged at 5V.
    For a trickle charger you need 13.8V output (presuming a 12V battery).
    This means you need to add a voltage step-up circuit, and a shut off circuit. Sometimes it is possible to modify the charger to double the voltage (and half the current) by simply replacing one or 2 components ... but lets be realistic, it is not worth neither the time nor money. A month ago I payed 5$ for a brand new trickle charger (free shipping from China) and it works just fine.
    For the price I could not get the empty plastic housing in my local electronics shop
    Since the advent of selfadhesive LED strips, I found myself quickly run out of old chargers because all of my friends wanted a lenght of LED for aquariums, PC keyboard illumination etc ....


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