Some controllers have temp comp but not remote, so the temp is where the controller is. However, since the controller should be mounted close to the batteries if possible, this can make the temps "close enough" for ambient at the battery.
So far as getting the temp right for inside the battery, that is a whole other thing. Not clear that attaching the temp probe to a battery post does that either.
From what I have seen, temp comp doesn't matter while camping anyway. That would be more of a Float, storage requirement unless you are camping in winter in Regina or in summer in Death Valley :(