Nokia are making a phone that emits annoying beeping when the battery is full. Apparently this will save a huge amount of energy.
What would save even more energy, and not be annoying, would be for the phone to send a message to the charger to tell it to power down when the battery gets full. A properly designed switching supply should, in any case, draw very little current from the mains when the mobile device isn't taking any current.
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