Batteries have Vr=ESR * I drop and dVc = I * dt/C for a good 10850 nominal C~10kF , ESR = 50 mohm new, while Vbat= Vc+Vr.

So as SOC drops below 10% ESR rises sharply and when mismatched aging causes C mismatch to accelerate down.

The inverse occurs from CC to CV and weakest C gets overcharged. So always keep them balanced or run in parallel.

For longest life, otherwise match all cells from the start <0.1% and prevent long time over 4V and under 3.2 or 3.0.

Trickle charge start if less than 3.2 V due to high ESR state.

Read up on Battery University and consult with OEM for best advice.

How you use your batteries depends on your priority for longest run time (short term) or most charge cycles (10x more long term).

Batteries have Vr=ESR * I drop and dVc = I * dt/C for a good 10850 nominal C~10kF , ESR = 50 mohm new, while Vbat= Vc+Vr.

So as SOC drops below 10% ESR rises sharply and when mismatched aging causes C mismatch to accelerate down.

The inverse occurs from CC to CV and weakest C gets overcharged. So always keep them balanced or run in parallel.

For longest life, otherwise match all cells from the start <0.1% and prevent long time over 4V and under 3.2 or 3.0.

Trickle charge start if less than 3.2 V due to high ESR state.

Read up on Battery University and consult with OEM for best advice.

How you use your batteries depends on your priority for longest run time (short term) or most charge cycles ( up to 10x more charge cycles, long term if you have dual packs and only use SOC from 80% to 30% i.e. have the available capacity with BMS or parallel cells.

Eventually the weakest parallel cell supplies less current and the stronger cell gets weaker faster supplies more current until they match for Capacity, if not being over-stressed. But heat will stress aging faster 2x per ~10'C rise from Arrhenius Effects.