On Tuesday, January 16, 2018 at 2:41:33 PM UTC-8, et...@whidbey.com wrote:   
   > On Tue, 16 Jan 2018 13:16:24 -0800 (PST), George Herold   
   >  wrote:   
   >    
   > >On Sunday, January 14, 2018 at 3:01:06 PM UTC-5, et...@whidbey.com wrote:   
   > >> I use enough CR2450 coin cells in equipment in my shop that I think it   
   > >> makes sense to test a few brands against each other to see which is   
   > >> most economical. I don't  know enough about how to load different   
   > >> battery chemistries to test the batteries. But I was thinking about   
   > >> just using an LED and a resistor combination so that the battery would   
   > >> drain to some particular voltage in about a month. I can use a battery   
   > >> I just replaced because it won't power the welding hood anymore and   
   > >> use it for the low voltage reference. Maybe the battery package will   
   > >> show the supposed milliwatt hour capacity and I can test for that too.   
   > >> Or maybe there is an online reference to a standard capacity.  Am I on   
   > >> the right track?    
   > >> Thanks,   
   > >> Eric   
   > >   
   > >Googling cr2450 MAH (milli-amp-hr) they mostly look to be the same.   
   > >~600 or 620 mah.     
   > >   
   > >George H.    
   > Thanks John and George. I really shoulda thought about using just a   
   > resistor as the load. I don't have any way to log the voltage over   
   > time except to measure it manually every now and then. That will   
   > probably be good enough though.   
   > Eric   
      
   A 4$ arduino clone on ebay with a 3$ LCD display, a load resistor and a free   
   sketch would do what you want.   
      
   G²   
      
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