ted:
Just one example.
3.7 battery,charger voltage supply 4.2V, current limit 600mA, battery is stop taking the current from power supply when reach 4.2V
The end of my discutions.
Well, OK, in this case it sounds like you're charging a particular kind of Li-ion battery. But, you're still not actually saying what chemistry you're talking about. So, it gives the impression that you think all chemistries can be optimally charged in the same way.