From: scientist77017@gmail.com   
      
   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 in my case.   
      
   I need a calculation for an ending voltage of around 2.0 volts.   
   (At 2.0 volts, my clock starts losing time.)   
      
   Thanks   
      
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