Hi,
Please keep your focus on the measurement of the battery voltage. (
The divider won´t change the voltage drop.
Independent what solution you choose, if the voltage drops it will be measured. And this is what it should do.
So the difference is, that one has a resolution of 1mV, the other 3mV.
--> If you need a better resolution than 3mV then you need an active (Opamp circuit) solution.
If you are satisfied with a 3mV resolution, then simply use the resistors.
It doesn´t change anything on software, nor battery or anything else.
Klaus