What would happen if you used a 24v battery pack in an 18v cordless drill? Will this damage the motor?

Thinking about overclocking some of my 18v power tools.  I can adapt 24v battery packs to fit into them.  Obvious advantage is they will run faster and should run longer with the extra power.  My only concern is can this damage the motors?  I think the only real risk is overheating but it I take steps to avoid that would everything else be okay?  I've also considered hooking two battery packs together to run an 18v saw at 36 volts.

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frollard5 years ago
It will work, but for much less time.

Most cordless tools now are powered by solid-state switching rather than a physical switch -- this gives the ability to vary the speed efficiently. The motor will take a higher voltage most of the time, but will heat up more and wear out much faster. The driving circuit MAY NOT be designed for the additional voltage (might be using components that are near their max tolerances at nominal battery voltage)...so the extra 33% could destroy them.

Other consideration is the motor at twice the voltage would run at twice the speed, but not twice the torque, which is the downfall of most battery tools; low torque.
etcmn (author)  frollard5 years ago
Thanks, this is some useful information. I'll need to look at the wire guage used and what, if any capacitors, resistors, or other electronics might be used in these tools.

I know it's an old post, but one an instructable, always an instructable...so, did you ever run the drill at 24VDC or 36VDC?? And obviously...how did it go?

caarntedd5 years ago
I've used a 9v drill with a 12v battery for years without any problems.
iceng caarntedd5 years ago
Good drill for Martian duty ;-)
iceng5 years ago
If I was stuck on Mars and that was all that was left, Then I would try it.
nurdee15 years ago
It might work. But I wouldn't risk it.