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Unless the words "deep cycle" are prominently emblazoned on it, assume that it is not because true deep cycle batteries are a LOT more expensive.
I run a number of dew heaters and an argonavis off a 12ah battery and never look like running it down in a night, so a standard 17 for you no worries at all. You could get away with a 7 if you're only running the heq5.
All you need is a cheap power-tank unless you want to start running a laptop then running those power sucking beasts gets more complex.
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