>>>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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