Alt-BEAM Archive
Message #00183
To: beam@corp.sgi.com
From: Bob Shannon bshannon@tiac.net
Date: Thu, 04 Feb 1999 21:58:58 -0800
Subject: [alt-beam] Re: Button Cell batteries.
Jean auBois wrote:
>
> At 8:39 PM -0700 2/3/99, Matthys Meyers wrote:
> : So what one are u meant to cut up and what parts are u meant to use.
> :One of those rectangular 9v batteries or one AAA battery?
>
> This is a question for the leadership at large: wouldn't it be a better
> design and somewhat more aesthetic to use alkaline button cells? They tend
> to have a fair amount of charge available, you can easily find cell holders
> for the thinner types and you don't (usually) have to worry about nasty
> chemicals or metal cuts.
>
> Zoz
Button cells can be had with 500 maH capacities, but their designed
discharge
rate is very low, much lower than the demands of a walker or even
photovore.
These cells expect microampers of discharge current, then they will last
forever.
Draw even a faction of a milliamp, and the total energy delivered over
time begins to drop off very fast.
Powering a walker, your would be spending several bucks and hour with
button cells.
If you can find small Varta rechargable Ni-MHD button cells, you would
be doing much better! You would get nearly the same energy density, and
rechargability.
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