I recently had a few batteries rebuilt; two for my 15v Panasonic drill/driver, two for my Makita 9v (which I use the heck out of, mostly that little reciprocating saw), and another for my *olde* DeWalt 14v set that I use in the shop primarily. I think I'll be getting batteries rebuilt rather than buying new tools, at least for the time being. The rebuild technology is very, very good...they come back with more pop than the originals and the process costs 50% or so less than buying new. I used an outfit called Primecell and wouldn't hesitate to recommend the service...
cg