Just got my new Bidallies 1500 in, installed, and charged. I'm probably never going back to my stock 1350, but I'm unsure what to do with it. Obviously I want to keep it in case I ever have problems with the Bidallies, but what's the best way to actually store it? Full charge, half charge? In a desk drawer at room temperature or in the freezer or something? Anyone got answers on this one?