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  1. #1
    Senior Member
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    quick wiring question

    I'm bought a broken scooter from the thrift store, and I took it apart, rebuilt and rewired it.

    I have it working now, but I need to be able to charge the batteries. Right now I have the batteries wired straight to the motor with an on/off switch on the handlebars. Where in the circuit do I wire the charger port? The one I have has two wires coming out of it. Do I wire it in series?

    I also want to build a simple circuit to let me know when the batteries are charging and when they're full. Any ideas?

    Thanks in advance for your help.

  2. #2
    Senior Member
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    2008 Currie eZip Trailz, 1971 Raleigh Super Course, bought new for Honeymoon camping trip around Nova Scotia
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    Toaster

    The charger goes right across the battery (get polarity right). I've attached a crude schematic.

    Be sure swith is off so that you aren't 'charging the motor. Usually the charger has LED's Red => Charging Green => Fully charged.

    Don
    Attached Images Attached Images

  3. #3
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    thanks, that's just what I needed.

  4. #4
    Senior Member wernmax's Avatar
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    Simple 4 Led visual voltage level for 12V battery from Radio Shack's "Getting Started in Electronics".

    Nowadays you can usually get a digital volt meter for less than $5 so it's hardly worth the trouble of building this unless maybe you want it incorporated permanently into the bike as a voltage level indicator.

    Lower 2 LED's could be red, 3rd yellow, 4th green, for full charge. You would have to calibrate it with a voltmeter to set off LED's at proper voltage points. Haven't checked lately but Digikey probably has this as a single "all-in-one" chip now.
    Attached Images Attached Images
    Last edited by wernmax; 05-16-09 at 11:24 PM.

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