We've got a store in NJ called Batteries Plus. Not sure if they're nationwide or what, but we give them a lot of business. Whether I need batteries for a drill, a transit laser, a floor scrubber, or a 60 year old bulldozer they've either got 'em, can refurbish them, or can outright make them. They can be a bit expensive, but they also save me a lot of time and money sometimes.