Another big thumbs up for Thomas D... I've been dealing with them for a few years now and they have always backed their products well. Since switching to low discharge cells, I haven't had a failure, but when I used to using the mimh regular cells, they would always honor their warranty. They even arranged for a charger to be exchanged after it exhibited flakey behavior. They took my work for the intermittent problem.
They operate in Illinois, where I am, and there's a guy there named Eugene who is part owner. He'll talk to you and steer you right.