Fuel-cell batteries is a dead idea. There are only two practical applications for fuel-cell batteries:
1) Extended-Range-Extended-Life: Satellite phones, like mountain climbers, first responders, search and rescue, hunters, fishers, people at sea (including ferries and cargo freighters.) Which requires replacable battery types. Smartphones are not even a viable market for this.
2) Extended-Range-Electric-Vehicle: You are not going to see Fuel Cell cars and buses. You're going to see Fuel Cell train engines, 5th wheels, and RV's. Basically vehicles that are super-inefficient as gasoline to begin with.
Fuel Cell's aren't going to compete with LiPO. You can only charge fuel cells a handful of times. This makes their target market something more like flashlights and emergency use. You're not going to stick them in anything that is currently LiPO or NiMH. What you're going to do is have a general-purpose power "brick" that you plug in things that need a charge via USB. This is great when you're at a convention that wishes to charge you a few thousand dollars to have an outlet. But you also have to go back to your hotel room sometime.