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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

    yam

    1
    0
    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

    Resqueline

    2,848
    2
    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

    Zellarman

    8
    0
    Nov 9, 2011
    assuming polarity was correct, what would the 1N4001 diode do?
     
  4. poor mystic

    poor mystic

    1,068
    31
    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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