How to keep the consistency of the battery pack.

Though there is a strict battery selection procedure, after a certainperiod usage, the non-homogeneity will appear more and more obviously.Meanwhile, charging equipment can’t choose and recongnize the weak battery out,so it is user who can take control of how to keep the equilibrium of batterycapacity. User would better test the OCV of every battery regularly orirregularly in the middle and later period of battery pack usage and rechargethe battery of lower voltage separately, in order to make the voltage andcapacity as the same as other batteries , that decrease the difference betweenthe batteries.