I parallel charged 6 x 3S, 450 mah lipo batteries on my ISDT 150 W charger twice with one slow flight, ending at 3.9V in between). Both times the ending charge is as follows:
Multimeter: V_cell = 4.2, 4.2, 4.18
Charger: V_cell = 4.2, 4.2, 4.2
Is the 0.02 V error fine in this case, since it’s on the low side?
My batteries internal resistance (given by the charger after charging to 4.2V) is as follows:
First Charge: R_cell = 5.4, 5.3, 5.7 mOHM
Second Charge (After slow flight ending at 3.9 V): R_cell = 5.6, 5.4, 6.1 mOHM
Is this okay or is the increase in internal resistance bad?