Well, if it makes you feel any better, I've fried a $350 battery using the vest. I spent yesterday taking apart the whole system to try to figure out where I had lost electrical continuity, and tomorrow I'm replacing the connectors for the vest, which simply refuse to mate. (Apparently it's a known problem with that type of connector; if you have to put too much heat into the terminals to get a good solder joint, the plastic softens and the blades of the connector move, and they won't fit any more.) I've owned the thing for over two years, and done about a dozen dives with it . . .