The number one problem people complain about in almost all devices is the battery. I wouldn’t mind buying a phone with similar specifications to the one I’m currently using if it had at least three times the battery life. Engineers from Northwestern University have found a way to make a devices lithium-ion battery charge ten times faster and last ten times longer.
This technology is estimated to arrive in the next two to five years. The downside to it, only works with lithium-ion based batteries. By the time the battery is set to be available, we will certainly have quad-core Android devices . So I’m not sure how will it handle battery-hungry mobile phones. More technical details about this new technology here.