110V AC to 12V DC suggestion

[mglucido]

We're building a control system test board (power distribution board, cRIO II, DSC, radio, Jags, et al) and I looking for a team with experience using an AC-to-DC transformer as a substitute for the 12V battery. It'll be easier than lugging around a battery while doing testing.

I see several sites that sell transformers but I don't know enough about the output of the 12V cell to know I'm getting the right thing.

Any help will be greatly appreciated!