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Running a 9 volt Motor on a 12 volt Battery

Usually, I have gotten away with this, BUT... depending on the quality of the windings in the motor, it could burn through the tiny wire in the motor winding. I have done this many times with no problem, but have also burned out a few motors.

One good example is that I have several [from the "early" days] cordless drills. The early ones used anywhere from 6 to 9 volt battery packs.

I then bought a 12 volt drill at Harbor Freight and Tools, and when I got it home and examined it I realized that the 12 volt battery pack was IDENTICAL in size to the older 6 and 9 volt packs.

So, after charging the new 12 volt pack, I tried it in the older 6 and 9 volt drills. Lo and behold, it worked fine, with just a little more RPM and drilling power.

I then called my Electrical Engineer brother and asked him about it and he said that those small drill motors are not that sensitive to even a doubling of voltage and perform OK with 12 volts on 6 and 9 volt units.

That was about 4 or 5 years ago, and for some time, I've been using 12 volt battery packs for all three units [6, 9, and 12 volts]. When time came to replace failed 6 and 9 volt units, I switched to 12 volt packs for all 3 drills.

Again, I think 12 volts will be safe for your 9 volt motor, but it depends on the motor.

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14y ago
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14y ago

A 3 volt motor will burn with a 9 volt battery. Not recommended.

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Q: Can a 12 volt battery safely run a 9 volt motor?
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