What batteries and charger did you buy, Skip? Are you planning to do your PzIV like Philip did, using two batteries that charge in the tank? Most people (myself included) don't think it's a good idea to charge batteries inside the tank, but Philip's set up looks good and should be plenty safe, since he's using nimh batts. I wouldn't try that with lipos, but with nimh batts it seems to be OK. At least I haven't heard of any problems with Philip's set up.

Can't wait to see photos of the PzIV build!