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Thread: Charging batteries the manual way

  1. #1

    Charging batteries the manual way

    Okay this is mainly for fun and games, so I'm aware I might end up wearing out my battery, that's okay.

    I have one of those disposable digital cameras that doesn't need to be disposable, and it takes AA batteries, in a moment of boredom and genius today I decided to make it run off an old cell phone battery. That much works.

    Charging... I want to charge via USB if possible, just for the 8)ness factor. If I just hook up the USB +5 and GND then I'll end up overcharing the battery, but I'm thinking I remember reading something aboutt using some kind of diode and it would only allow current to pass through if the voltage difference is greater than some value, so that way I could have it stop charging after it was full, right?

    Any info you guys can provide on building a battery charger (li-on btw) would be much appreciated.

    And don't worry, I'm being careful.

  2. #2

    Re:Charging batteries the manual way

    I took a electronics class a while ago. But I think a diode will not do it. Simce it makes electricity flow one way only. What I think you would need is a resistor.

  3. #3

    Re:Charging batteries the manual way

    [quote author=gmoreno link=board=14;threadid=8960;start=0#msg80871 date=1080886868]
    I took a electronics class a while ago. But I think a diode will not do it. Simce it makes electricity flow one way only. What I think you would need is a resistor.
    [/quote]

    I don't want to lower the current, I want it to only flow if the voltage is below a certian level, and flowing one way is fine, power source to battery, not vice versa.

  4. #4

    Re:Charging batteries the manual way

    Yes...it's been a few years since I last touched circuitry, and I'm kinda glad for that. IIRC, a diode will kick in when the diode voltage Vd is >= the threshold voltage for the diode (which I believe is rated by the manufacturer).

  5. #5
    Guest

    Re:Charging batteries the manual way

    search google for "trickle charging", that's the most effiecient way of recharging a battery.

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