I've got cordless tools from Ryobi, Sears, Dewalt, B&D, and Panasonic. Many of the higher end tools like my Panasonic and Dewalt tools have very expensive batteries, and an off-brand replacement or rebuilding might make sense if it isn't too expensive. For tools like the Ryobis though, the batteries are so cheap (often on sale for $40/2), that for me it isn't worth my time to rebuild them. I just buy new batteries every couple of years. My original two Ryobi batteries lasted around 3-4 years before I disposed of them, and the four batteries I currently have I bought 2-3 years ago IIRC, and three of them are still performing well, I'll probably buy a new pair of the 18V Ryobi batteries next year for $40-45. I use one of my Ryobi batteries every day at work (drain it 80-90% down) for 4-5 months of the year, so they see moderately heavy use. I'm just glad the Ryobi batteries are so inexpensive, the Dewalt batteries I need cost 2x-3x as much. IMO a new pair of batteries every two years for $40-45 isn't bad at all. If you want longer battery life and better performance, you can buy the Ryobi li-on batteries which are backwards compatible, but they need a different charger and are much more expensive.

I've been to online stores www.battery-replacement.org  and the regular batt's are now 2 for $50.00 and the Lion batt. (1) and charger kit is $120.00 So for the money I'll probably buy the 2 for $50.00 regular batt's.Btw I like your sig line that is a funny movie. It's full of funny physical and sight gags