I had been using this timer to run two watch winders for several years when it crapped out. I like it as it has two outlets and did exactly what i wanted it to do. So, i opened it up expecting to find a soldered in dead battery (manufacturers typically don't want to spend the money on AC/DC converters in their products) and there it was: a 2032 @ ~1v. Strangely, it wasn't soldered, but crimped so that two metal spikes where driven into the battery on each side. Had to pry them off, and then i soldered a new battery in as i don't have a tool that will do such a cramp. See illustration, the original battery is the yellow circle.