This might help you out.
Part 2.
As far as batteries check the local fire alarm dealers. Metro suggested this and I was able to get all the batteries I want when they don't pass the required test. Most systems have 2 batteries and if one is bad they replace both so there's a good chance to get a good battery when they check the systems. I can also buy them out right for 18 bucks for a 12v 12ah battery.
