From: whit3rd@gmail.com   
      
   On Friday, September 20, 2019 at 3:14:30 PM UTC-7, AK wrote:   
   > I want to calculate approx run time of a D cell with a capacity of 13,000   
   Mah.   
   >   
   > I assume that Time(H) = Capacity(Ah)/Current(A) equals a final battery   
   voltage of 0 volts which will not work ...   
      
   No, the mAh rating comes with an explanation of the test conditions,   
   you just need the full manufacturer's data sheets.   
      
   Sometimes there's a time/voltage graph, and you can chose the cutoff   
   voltage and measure area-under-the-I-V curve.   
   Sometimes there's a specified V when fresh, and V when dead   
   (alkaline, typically 1.5V fresh, 1.0V dead;  lithium, typically 3.6V fresh,   
   3.0V dead).   
      
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