I use cordless tools for a living. I was a long-time Makita user since they made a good tool that held up to tough use. When my last Makita Nimh set went belly up from bad batteries and charger, I started shopping. At the advice of a friendly HD sales guy, I opted for the Rigid set. Rigid has a lifetime warranty on batteries, tools, and chargers. They state their 18V impact has the most torque in similar voltage tools.
I recently enforced the warranty on a bad battery. A phone call and my new battery was shipped. Another phone call had a new lifetime warranty on the new battery. That warranty is gold for a guy that uses these tools almost daily.