I am having trouble deciding weather 20, 21, or 22 batteries are the right 
series string for a 72vdc battery.  for a 3.7 volt battery 20 seems to be 
right.  However I have A123 batteries and nominal is 3.3vdc.  Videos on YouTube 
are inconclusive. Sellers details not complete.  Any advice appreciated. I'd 
like to run 1 or two strings for a small ebike battery.  The controller only 
draws 40amps.  Lawrence Rhodes
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