I ran across the info on the only vendor supplying this alternative power supply. Contacted some in-house maint: guys at two of the companies who have implemented this stuff, and I gotta tell you, they sounded pretty positive about the technology. Twice the lifetime of a lead acid battery, 9 to 10 hours run time on the pallet jacks (class 3), no low voltage drop, no heat damage associated with the drop, huge incentives from both federal and state govt's. I believe this technology is about 5 to 7 years ahead of its time though, and wont really take off as the company hopes. But once again, I talked to actual mechanics at these sites and they bragged about the things.