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I have been reading about their development for the past couple of years, but now it seems that the first system for fuel-cell camera batteries has hit the marked. DV magazine gives these a 3 1/2 out of 5 ratings:
Makes great sense for off the grid applications–network remotes and military use–where shipping issues and wrangling refill tanks are incidental to getting the shot. For more typical shoots, the convenience and familiarity of batteries is hard to beat.
When you are shooting in remote locations, this might be the god-send. But give that technology a bit more time, and I guess they will be the new LiIons.