12 volt fan on 5s ?

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my xt8 running 5s and MMMM with a temporary 7xl needs a fan on the motor. this is no NEU motor LOL>

i have a 12 volt fan mounted. u think 5s would give it a melt down?:-)

what is easiest temporary way to turn it on?

im using the stock MMM and it is working so far.
i could stick a small 2s lipo battery just for the fan but then the fan may have to little voltage.HUMMM