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Re: Spring Power. was Re: Power source

From: Vaughan Pratt <>
Date: Sun, 07 Nov 1999 23:58:29 -0800

>Although you can't charge an AA battery that fast, we now at least have
>figured out that 36 feet is how far your 125-lb weight needs to fall to
>charge it.  So you just have to arrange for the 125 lbs (you or surrogate)
>to cover the 36 feet vertically slowly enough that the AA battery can
>absorb the charge without overheating.

I forgot to add the implication that to store an AA cell's worth of energy
in a spring by standing on a lever, you have to move the lever 36 feet.

For the equivalent of a Sony NP-F950 (32.4 WHr) you'd have to move the
lever 686 feet using your 125 lbs of body weight.  I'd prefer to just
plug it into a charger and come back a couple of hours later.  But I'll
concede that if you're deep in the Amazon jungle with neither power
outlets nor solar power this might not be an option.

Vaughan

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