Considering lithium-ion variant when picking a BMS board
A primary consideration on cell ageing rate is rapid in time spent over Vmax duration time.  The activity is accelerated by temperature rise. Therefore a better design incorporates thermal sensing for say a 10'C(est.) rise above ambient, along with recommended CC rate of 625mA or 0.5C with recommended CV level.

This unit is precise but a bit high above Panasonic spec where ideal to match spec. would be 4.20V +/-0.05V (est. typ. tolerance)


BMS SPec: Overcharge voltage: DC 4.25-4.35V ± 0.05V


The Panasonic specs are CC rate = C/2,  4.20V CV  4 hrs


C/2= 1625/3250 {from  CC mA/capacity mAh}.   


Batteries have memory effects from longer time constants you can see the effects of this during the CV decay curve. (See below)  The slopes of V(t) for CC indicate the ESR*C=T1 effects and dV/dt=Ic/C and I(t) CV indicate the memory tandem capacitance which has a longer ESR2*C2 =T2 time constant.



The 3 specs for charging are; CC rate, CV max and CV current cutoff to get max capacity. Panasonic believes this is the best tradeoff for performance vs capacity. But the choice is yours on the effects to life charge cycles as going beyond these specs degrades life cycles.