High efficient battery technology will become, if not already are, one of the major research areas in 2011. Mobile devices, hybrid car, electric car, etc, need a better battery. I can't wait to have a smartphone which doesn't need to go back into the charger in 1+ weeks.
A side note, usually, military research is leading the technology for a couple of years. Lately, news indicates that the time gap of new tech development between military and commercial becomes narrower. Battery technology is one of the examples. I am expecting there are more to come in the near future.