Hot 9v battery with PC fan (LED integrated)

Discussion in 'General Electronics Chat' started by Jackbenimble, Aug 31, 2015.

  1. Jackbenimble

    Thread Starter New Member

    Aug 31, 2015
    2
    0
    Hi Guys,

    I'm getting a really hot 9v battery when connecting to a 12v pc fan. The fan has LED's build in and there's a toggle switch between the battery and fan. I assumed it was pulling too much current from the battery so I tried added a 330ohm resistor, but the fan no longer spun. Any thoughts? Thanks.

    -Jack
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    When you are using a small PP9 battery, it is not made for high currents.
    The battery will gat hot due to the high internal resistance.

    Bertus
     
  3. #12

    Expert

    Nov 30, 2010
    16,355
    6,852
    Leave the resistor out and watch for flames. :D
    But seriously, that tiny battery is in a death struggle with the fan. It just isn't big enough.:(
    Pay attention. The heat could get unreasonable.
    Have you ever put a 9 volt battery in your pocket with some coins? Frightening how hot it gets!
    I don't think it will start oozing its guts out, but watch it closely. This is the wrong thing to do to that battery and it won't last very long.
     
  4. Jackbenimble

    Thread Starter New Member

    Aug 31, 2015
    2
    0
    Thanks for the help guys. I'll look into a bigger power supply.
     
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