I have a 7S battery (made out of 168 x 18650, 24 each bank) and each bank goes into a voltage divider to make a safe voltage read into two ADS1115. Each ADS1115 has it right address and works fine reading.
the only problem I'm facing is in the first bank (which has no voltage divider and measures between 3,3 and 4,2V (good health of 18650 Lithium battery) is that it reads fine when no charge is being applied to the hole battery, but when charging the voltage get slightly off by a 0,015v.
all the other bank reads well with the charging state.
should I use a voltage divider as somehow needs a load resistor de ADS1115?
should I use a capacitor between A0 and ground to stabilize readings? (I make 50 readings and average them for each bank every loop to have a consistent value)