I was thinking about the solar panel idea for charging, then I remembered something I saw
here talking about by-pass diodes.
So it got me to wondering if I could install a by-pass diode between each battery (effectively each "solar panel"). If one battery becomes a higher resistance, then the current will flow to the next one until the second one becomes too high resistance and then so on and so on.
Here's what I am thinking:
You can see the by-pass diodes between each cell, effectively making a path of less resistance to the next one.
Will this work, or is my electrical theory incorrect somehow?