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6 volt led lantern

Discussion in 'LEDs and Optoelectronics' started by yam, May 1, 2011.

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  1. yam


    May 1, 2011
    I'm no genius when it comes to electronics, so please bare with me... I have a LED lantern that runs on 4 AA batteries. It also has a usb port that will allow you to plug into a laptop or usb output and power it as well. I wanted to extend the longevity of its use by wiring a bigger 6v 12ah NiCAd battery to it. I want to use it in a camper. I cut a old usb cord and I soldered an alligator clip to the red terminal (+) and the black (-). I then connected to the battery and plugged it into the lantern. The lantern will turn on, get real bright and then turn off. I assume it is a safeguard due to too much power. I put the AA batteries back in and it still works.... But I cant use the bigger battery. What am I doing wrong here?
  2. Resqueline


    Jul 31, 2009
    It would be surprising if a simple thing like a LED lantern checks the USB spec (which is 4.75 to 5.25 Volts, or 4.4 to 5.25 Volts for low power devices).
    Most of the cheap Chinese USB products puts out a far wider voltage range btw.. You can try if it helps with putting a 1N4001 diode in series with the NiCd battery.
  3. Zellarman


    Nov 9, 2011
    assuming polarity was correct, what would the 1N4001 diode do?
  4. poor mystic

    poor mystic

    Apr 8, 2011
    The diode would provide a "forward voltage drop of about 0.6V", which means it would lower the voltage that the led lantern gets from the battery by a bit more than half a volt.
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