----- Original Message -----
From: "Sean H. Breheny" <shb7@CORNELL.EDU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, November 19, 2000 1:01 PM
Subject: [EE]: Small batteries


> Hi all,
>
> Two quick battery questions:
>
> What type of battery would you recommend for a situation where you need
> about 9V, 20mA, for about one minute at a time (followed by about 30
> minutes of off time), repeated several times? The battery must be as small
> and light as possible (this is for a model rocket altimeter). Are there
> coin cells capable of this current level? If so, several could be stacked
> to get 9V.
>

Three lithium coin cells, 20ma is pushing it but...so what.  I measured S.C.
current of 2032 coin cell at 60mA.  They would be light and compact.

> Secondly, I remember small (smaller than AA size) 12V batteries being
> discussed here some time ago, but I can't find a supplier or the name of
> the type of battery. I think they might be used in wireless controls (such
> as car door lock transmitters).
>

Used in cigarette lighters.  Try a tobacconist.  Should be able
to get them where you get batteries, like 'Walmart' etc.  Or maybe a
watchmaker/place where they replace watch batteries, and electronics
stores and places where they replace keychain transmitter batteries.


> Thanks,
>
> Sean
>
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