Batteries remain the weak point of even the most sophisticated smartphones.
It's not that battery technology is stagnant; it's just that our thirst for faster, smaller, cleverer devices is racing forward faster than our capacity to power them.
Many users of Apple's iPhone 4 and 4S – devices I still rate as best in class – struggle to get through a busy business day without running out of power. Many solutions have been proffered to provide extra juice on the move, but many of the systems I've looked at are bulky and cumbersome – somewhat at odds with the sleek design of the phone they're powering.
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