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It doesnt need to be a large power source either.
I use a 12v Makita rechargeable battery pack for a cordless drill. 1.2 or 1.5 amps. Only because I've upgraded to 18v and 14.4v tools.
These power the fan, the Telrad with a heater and a couple of LEDs and last for ages without having to recharge.
Check out whats available and choose what suits. A compact pack can be fitted to the base. The larger packs can be used for other things as well.
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