So I just received my Magic Shine Jr./Cree light in the mail (have to say it wasn't that much when I ordered it). I'd really like to be able to leave the battery pack on the bike when locked up, so I was thinking about ways to mount the battery pack that would make it difficult to steal. Has anyone come up with a "theft proof" battery pack holder? Pics?

The down tube shifter mounts on my bike are empty, so I was thinking they might work as some sort of mount. Thoughts?

Also, if someone does end up stealing the pack how difficult is it to find/construct a new pack?