This thread got me thinking. I used to work as a pilot in Puerto Rico (for a brief period a long time ago) and although I did not have a car on the island, many of my colleagues did. It was very common to have the battery stolen out of your car while it was parked in the airport lot, and owners went to ingenious lengths to lock up the batteries. It was a long time ago, and I can't remember what they did. But now I'm thinking I would hate to have my battery stolen while out prospecting. But locking hood latches are not the answer, because if I lose my key out in the woods, or lock the key in the Jeep (it's happened), and my hood is locked, I can't get to the spare key hidden in the engine compartment. That would really suck. So I'm looking for a way to lock the battery down in place. Does anybody have any ideas?