[JThiessen]

I think it would be a nice thing if it were at all feasible - but you may end up biting off more than you really want to take on - way too many different manufactures out there, and they are constantly updating what they offer based on technology changes.
1) I dont think listing the sales site is a good idea, as there are so many different places that sell the mainstream batt's.
2) You pretty much would have to list the mfgrs sizes, as you and I could both measure a pack ten times, and come up with different numbers every time.
3) would wire size also be needed info?
4) Maybe a field that would specify what connectors they come with. For those that can be ordered with different ones, you could just use "user specified", rather than list all the possibilities.