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9 volt Battery getting very hot, why?

I made a distortion pedal for a guitar.

It works fine.

But if I leave the 9v battery in there for too long, it starts to get extremely hot. 

Why is that? And what can I do to prevent that from happening?

Thanks for your help.

kelseymh4 years ago
The circuit is drawing too much current.

If you built the circuit yourself, the first thing to do is to look for short circuits -- if a lead or pin from a discrete component is sticking out, it may be contacting the case; or you could have a solder blob that is connecting two different pins which aren't supposed to be connected.

Another possibility is that the circuit, or some component, just draws too much current to be safely supplied by a 9V battery. They typically have just a few hundred mA-h capacity. If you have to replace the battery every couple of hours, then the circuit is probably too much for it.