One of the biggest challenges is lack of standardization.
Vendors have cleared a number of technical hurdles but still must address some more obstacles before any of the new battery options become available.
Major vendors are using different types and amounts of fuel to power batteries of different sizes, so it will not be easy for them to deliver the volumes and scale necessary to drive down pricing.
Power management has been an area of focus, and handset vendors are delivering systems that closely monitor power usage and deliver only the amount of power needed.
The recognition and understanding of the need was the primary condition of the creative act. When people feel they had to express themselves for originality for its own sake, that tends not to be creativity. Only when you get into the problem and the problem becomes clear, can creativity take over.
I'll probably have the whole town there.
For fools rush in where angels fear to tread