Looking at the flat discharge curve for these batteries why not use 3
cells to get 4.6V
And unless you need the space, do it twice to get 168mAH

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Steve Murphy
> Sent: Friday, July 01, 2005 11:09 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]: How to efficiently run a PIC from 12V battery?
> 
> 
> 
> >>>3 x SR45 - 4.5V, 60mAh
> >>>      
> >>>
> >
> >It's probable that the DIY pack you and WCW mentioned is based
> >on something like the SR45, given the diameter. This might be a shot
> >in the dark, but if you stripped the wrapper off a 
> 12A......what would
> >you find ? Worth a punt ?
> >
> Done. There are eight button cells, about 3mm tall and 9.5 in 
> diameter--somewhat shorter than the 304 (SR45, a.k.a. 304, 
> a.k.a SR 936 
> SW, mouser# 614-394). Datasheet found here: 
> http://www.renata.com/pdf/watch/DB394.04.pdf
> 
> Thanks to all for all of the great information. For this 
> application I 
> think I'll forego the 12V and build my own 6V 84 mAh pack out of four 
> 304 cells and power the circuit directly.
> 
>   --Steve.
> 
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