Oops I forgot to add:

I charge mine every other day. That is mainly because for my best use the Hertz have to be high and that this is what drains the battery. In the beginning recharging really irritated me but now, I just do it at night when I am laying in bed. The battery does get a little irritated with charging which is a bummer but nothing compared to the CRPS pain.

Rather than turning it off have you tried turning it down to a very low stim?