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one hour to drain the battery seems pretty fast. if you're sideloading, you're connected via USB to the computer, so that alone ought to recharge the Arc7HD even if slowly.
on my 7HD and 10HD, i removed most of the pre-installed bloatware, so maybe some of that [on your machine] is using up battery power? it could just be updating every app it has and burning through WiFi power and memory write power. if you go into Settings, Battery, you should be able to see which functions are using up most of the battery power. Screen is usually the top culprit, with everything else using quite a bit less. if you tap on the one that seems to be burning through power too quickly, you can then adjust it. i keep my screen at no more than 50% (evening reading it at 10% or less).
assuming you bought it at Future Shop / Best Buy, you can always exchange it if after a week it's still wonky. just have a receipt handy!
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