Has anyone had a problem with a Phantom Tracker whilst disconnecting the main battery over the Winter Months, our 'van is in a storage compound, I contacted Phantom and asked them for advice and they said that they would know that I would have disconnected the 12V battery but the units own battery I was told would only last for a few days and the 'van should be connected to mains The storage where we keep it does not have mains hook-up, so we are snookerd, I dont like leaving the battery in the 'van for a prolonged period but if I disconnect it I would invalidate our insurance. ANY IDEAS PLEASE>