The Little Engine That Could Be: ‘At about one thousandth the size of a regular power station, the engine-on-a-chip will create about 1 millionth the power level, producing 20 watts of power at 2.4 million rpm from its cubic centimeter-sized package.

“It will give 10 times the amount of power that is generated by the best lithium battery”…

And when the engine runs out of juice you just fill ‘er up again. There’s no need to wait to recharge or run out to the store for new batteries.’ Wired