Thats a great idea, i would only use it with gloves though, dont like the idea of grabing a battery with my hands for an exteded period of time. Thanks for sharing the link.
Both poles of the battery are top side covered by the flashlight head here. It's not like the standard aaa, aa, c, d, cr123,... where the - pole is on the bottom. Perfectly safe and you won't be conducting any electricity.