Ballard Power Systems Inc (BLDP)

[uksausage]

Initially Ballard supplied the stacks for the largest genDrive fuel cell, powering the flat pack forklifts for heavy objects.
Walmart had quite a few and there were major servicing issues with them.
Plug subsequently developed their own plates to generate as mush and now more power than Ballards stacks so no longer bu6 them (2 years at least) some may be needed spoof servicing, swap out or to keep all units the same in any one DC