On Nov 9, 2005, at 10:49 AM, M. Adam Davis wrote:

> Lithium cells last a along time, have a high capacity, but they can't
> source much current.  You shouldn't plan on drawing more than 100uA
> from a coin cell if you want to get anywhere near its rated capacity.

However, you should note that there are many applications that 'cheat' a
great deal on coin cell specs, and still manage to achieve quite 
acceptable
battery lifetimes.  Those keychain LED flashlights generally use a 
couple of
CR2016 cells (20mm x 1.6mm), and assorted blinky magnetic LED tags use 
927
sized cells (9mm x 2.7?); they'll run for hours...  A consequence of 
this
sort of "novelty" use is that you can get Li coin cells quite cheaply 
when
ordered in bulk from china (or discount "wholesalers" importing from 
china.)

BillW
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