Hey Doug,
The distribution centre i work at allots driver's 7 minutes to change their own battery. They usually take 2 mins. A reach truck pulls into the slot, he removes the battery gate, jumps on the battery ease and draws out the battery. It goes into an empty slot then he draws a fresh one and inserts it into the reack truck.
Have you looked at the Crown video showing their reach truck? They specify that a hydrogen gas charge lasts "a full 8 hr shift" and takes about 5 mins to fill. The Wal mart warehouse has these cells now. I go there on occasion and thw workers there tell me there is little difference in run time. This warehouse needs trained personell to maintain these batteries as they need maintenance that cannot be performed by regular battery techs. I think big companies are using hydrogen to show they are "going green" It's hard to say if this is the way to go. I just hate to hear this being touted as "faster to change" and lasts longer per shift" when in fact it's at par, and 3 times more expensive. The Crown video admits the run time is 8 hrs. I was expecting so much more. Very dissapointed in run and install times.