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The battery on my PE seems to last pretty much all day with normal use, and it isn't a huge imposition to carry around the small original charger now that I've cobbled-together several others that stay plugged in (sorry eco-nuts!).
For me, messing with the CPU to save a bit more power is addressing a non-problem. As long as I can use the eInk side with the LCD turned off, I'm good, because it's the LCD that consumes the bulk of the power. Probably even more than the WiFi and Bluetooth radios, although that's just a guess.
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