If you can plug it in to at least a 15 amp receptacle, keep it in the "use" position. If you can't keep it plugged in, put it in the "store" position. If not kept plugged in, monitor the battery charge weekly to ensure that you still don't kill the new battery. Charge as needed. Some store/use switches don't disconnect all the 12 volt loads. Either way, check the electrolyte levels in your battery at least every 30 days, and add distilled water as needed.