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Thank you all for thoughts!
To clarify, I was wondering about a device that can alternate between DC power (via AC adaptor or USB) and battery power, as in laptops or netbooks?
Even simple phones work while being charged, but I presume the power goes through the battery still, as probably there is no other way. True, portable devices are not meant to be plugged in permanenty. But for uses near a fixed power supply, again laptops and netbooks aside, I envisage a unit with an e-ink or a color screen that uses the battery only as required.
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