Looking at the battery availbilty so much of this is theoritcal since things may change of both load and the battery itself.
   
  First off, battery was spec'ed 3.7V 4000mAh
   
  Just for the sake of numbers, lets say the load is
   
   
  4.5V @ 40mA (18mW)  ----> small boost, 85% efficient or so, assume its part of the 40mA
  3.3V @ 300mA (990mW)
  1.8V @ 160mA (288mW)
   
  Total of 1296mW.  Using a 3.7V battery, this is a 350mA draw (?)
   
  Again, for arguments sake, lets just say its 100% load.
   
  So to calculate the expected battery life....not just as simple as 4000/350 is it?  Thats 11 hours roughly.  I thought there was another value that 'derated' the capacity.
   
   

       
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