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Why bother with a battery? If the pad is going to charge it constantly, then a capacitor or two would be able to hold a little bit of a spare charge - you could really reduce the mouse weight (and cost) that way.
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Gigabyte P35-DS3L with a Q6600, 2GB Kingston HyperX (after *3* bad pairs of Crucial Ballistix 1066), Galaxy 8800GT 512MB, SB X-Fi, some drives, and a Dell 2005fpw. Running WinXP. -
I think there was a cordless mouse were the spinning of the ball charged the mouse. Of course, this wouldn't be an option for optical mice, but you could still have one of those systems like in expensive mechanical watches, were your movements charge the system.
For wearables, body warmth will be the desired power source - this could even be woven into fabrics and cool you in the summer, and at the same time charging your mobile devices!
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