I have 2 of these and they only run about 5 hrs each with new batteries,,has to be a better longer running fan for a muliti day trip so you don't have to pack a bunch of batteries.
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Pop the white tab out and reverse the tension spring that is attached to the white pice of plastic. The fan will now turn on and off by just using the switch and no refill.
I have the camo color one but the white tabs on the inside should be the same.
I am trying to work out how to reverse the fan so it will make it a true air mover.