Hot 9v battery with PC fan (LED integrated)

Thread Starter

Jackbenimble

Joined Aug 31, 2015
2
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
 

bertus

Joined Apr 5, 2008
22,270
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
 

#12

Joined Nov 30, 2010
18,224
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.
 
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