The power management (the small under voltage rainbow square and winking power light) stuff is all done in GPU code and not externalised on any userland interface. Since the RPi isn't designed to run from a rechargable battery it's not needed anyway.
Of course, there are lots of folks running them from LiPo batteries, solar arrays, etc. and there's even Dr. Stanford-Clark with his HyPi that runs from a hydrogen fuel cell.
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