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Oooooo brilliant thanks @parasquid.
I've got 15 resistors and created the 225 combinations to see what output voltage I can achieve (easy enough using a full outer join).
The best voltage was very low eg 2.3v, which felt too low. My assumption; at this stage; is the higher the voltage (below 3.3 of course) the better the data to understanding nuances of battery charge. I may just be over complicating things.Now I know I can connect them in series I have loads more option.
Thanks for the link, I was using https://ohmslawcalculator.com/voltage-divider-calculator
saj42
@parasquid
Ah one more thing about voltage dividers, you can use resistors in a series and their resistances add up. So if for example you have a bunch of 2k resistors, you can put 4 x 2k = 8k on one side and 1 x 2k = 2k on the other side and you'll have max 2.8v from a 14v power supply.
See https://www.allaboutcircuits.com/tools/voltage-divider-calculator/