A disconnected battery will not discharge due to any load connected. It will only need a trickle charge (minimum) about every three months and at the most once a month. If the car is stored, no need for an alarm system anyway.


Exactly, have a friend who uses 'battery tenders' of various sizes/prices (jetskis, pontoon boat, zero turn JohnDeer tractor, 2 four wheelers, and a couple of dirt bikes), he had one go up in smoke. Battery had to be replaced. I have maintained all my wet cells out of the equipment (lawn tractors) for the 4-5 month down seasons, and those tractor batteries have lasting well beyond the three to four years most of my neighbors have lasted. Took out at the end of season, cleaned the case, and trickle charged once every month or two until reinstalled in the equipment. Last battery bought was back in 2007 and it still cranks the tractor. If anything goes into 'storage' (not like the XF D/S airbag FCA fiasco), the battery is removed and kept separate. Works for me, isn't for everyone. I remember one picture posted long ago showing a XF burned up in a driveway, don't remember why but know it is a possibility when anything plugged in goes defective to the extent it catches on fire. Could also be said of anything plugged in so like I said, removing the cable, cleaning the top, and throwing a charge on it as advised might not be for anyone else.