My watch is a Casio that I bought as a dive watch for $50. The battery went dead after four years. I took it to a jewelry repair place and had a new battery put in. As mentioned above they made it clear that they weren't responsible for any leaks. For $3 I had a working watch and figured if it died on the first dive I'd just have to buy another watch. The watch has lasted another 2 years so far. Might not be a bad idea to pick up a $30 Wal-Mart special to have as a backup.