From: amdx@knology.net   
      
   On 8/23/2022 9:24 PM, bob prohaska wrote:   
   > Does anybody have a weblink for the temperature coefficient   
   > of voltage for commercial (Energizer) size 357 silver oxide-zinc   
   > button cells? Nominal is 1.55 volts, but knowing the temp effect   
   > is (maybe) important if I'm stacking up nine or ten of them.   
   >   
   > I'd like to check a trio of inexpensive Radio Shack DVMs for use   
   > in charging relatively-expensive lithium iron phosphate batteries.   
   > On the same battery the three meters report 14.41, 14.51 and 14.58   
   > volts, so they certainly disgree among themselves. I suspect but   
   > can't yet prove that the middle one is about 2% higher than actual.   
   >   
   > Yes, I probably should buy a good DVM, but the Radio Shack units   
   > are on-hand and except for charging batteries absolute accuracy   
   > isn't usually of much importance.   
   >   
   > Ten millivolts is plenty good for present purposes. If there's a   
   > better/cheaper improvised reference in this range please post!   
   > CR2032 cells are readily available, but voltage details are scarce.   
   >   
   > Thanks for reading,   
   >   
   > bob prohaska   
      
   Aliexpress, Ebay and Amazon have some for under $10, and more for under $20.   
      
   > https://tinyurl.com/2ajs395b   
      
   > https://www.google.com/search?q=5+volt+reference&client=firefo   
   -b-1-d&sxsrf=ALiCzsa702yEJPZb4SzokD4GXJ1Jimyrjw:1661422961250&so   
   rce=lnms&tbm=shop&sa=X&ved=2ahUKEwiA7rTr4uH5AhXOoWoFHb3PDVkQ_AUo   
   XoECAEQAw&biw=1472&bih=657&dpr=1.3   
      
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