Linked by David Adams on Tue 20th Jul 2010 18:09 UTC
Hardware, Embedded Systems Japanese printer company Brother has invented a battery that can be recharged by shaking it. It's intended for devices like remote controls that use very little power and would normally require infrequent battery charges, so unfortunately you couldn't use it to power a car that could drive forever on a bumpy road.
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RE[2]: Wristwatches
by nickelbackro on Sat 24th Jul 2010 13:09 UTC in reply to "RE: Wristwatches"
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Yeah my watch is an Invicta Ocean Ghost which is self winding and it has a glass backing which shows its mechanics.

There is a metal wedge that rotates around a pin in the center and winds the watch. If you don't wear it every day it winds down and stops. I'm thinking it must be geared very well because winding older watches required quite a lot of torque.

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RE[3]: Wristwatches
by xiaokj on Sat 24th Jul 2010 13:45 in reply to "RE[2]: Wristwatches"
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I would suggest gear ratios to help solve that problem.

ie when manual winding, you can supply more torque, acceptable as long as you finish winding before you the day ends. When winding by shaking, you just have to average more winding than consumed in order for it to automatically recharge, which is a much lower constraint. That means, the winding can take hours on end to complete, in many more rounds than a human will have the patience for. That is why we can expect infinitesimal torque requirements in automatic watches.

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