The batteries are the same for the Original and 2008 versions of the MacBook Air 1.6Ghz. They came with 37-watt hour lithium-polymer battery. The 2009 versions went to a larger battery. 40-watt hour lithium-polymer battery.
The board speed is faster in the 2008 versions so it uses different RAM. DDR2 vs DDR3.
As far as one place to find all the info I do not know of one other than looking at Apple's Technical Specifications on line at Apple.com as I did for the info above. Apple doesn't do parts list very often unless you have a subscription to their service resources. Best thing is just decide what you need the info on and look it up as you go.