IMax b6 Charging Problems - Voltage Inconsistencies

Hello all first post on this forum. So I'm having a problem with charging my 18650 cells with this Imax b6 charger. I have them wired in parallel with voltages within 1/100th of a volt as you can see in the first picture.



In the second picture I tested out the voltage of the group and it came out to be 3.26 volts.



I'm now starting to charge them using these settings...



But then 6 seconds in, it jumps to 3.50 volts.



So when measuring it's accurate, but then when I startchargingthe imax seems to think the battery voltage is around 0.24v higher than what it actually is. This is especially problematic when it gets up to 4.0 or 4.1 volts as it thinks it's at 4.20 so it decreases the amperage way down low making it take over 3 hours or more to charge. Is this a calibration issue? Or maybe my imax is bad? Help.

First of all its normal. You have resistance in the wires and you have somethiing called resting voltages. As long as the end voltage is correct then its fine.

When the Imax gets closer to its end it will cut down the current and then the resistance will cause the voltage to be closer to its real voltage.

On old cells you will see this even more since they have huge internal resistance.

Also, when charging, the voltage goes up anyways. Lithiums charge with CCCV. It'll charge at a constant current until the cell(s) reaches a certain voltage. Then it begins to decrease current and increase voltage. This voltage can be above 4.2V during charging. I usually see about 4.25V on the TP4056 chargers. But once the charging stops, the voltage of the cell will read 4.2V or even 4.18V.
You gotta remember electrons kinda operate like water when charging. Water will always try to seek lowest point. So when charging, the charger has to put in a little higher so the electrons will flow to the lesser (cell).

So you're all good

It should not be above 4.2V at cell level.
Its only above that on cheap chargers or on chargers with voltage meassuring. On cheap ones they dont care much and its generally +-0.1V easily. And on some they just compensate with 0.1V+ on CC step and hopes for the best. Unfortunately.

On those with voltage meassuring like for instance my iCharger you can see 4.3V at cable beginning but its never ever above 4.2V at the cell.