Well there is a belief that the slower you charge, the healthier it is for the cell. Although it has been my decades worth of experience that as long as the cell stays cool at higher charge currents, it does no harm. One thing I really like about xtar chargers as their chargers and the cells really stay cool during operation.
Then I ran into articles like this.
Study finds rapid charging and draining doesn’t damage lithium-ion electrode as much as thought
So xtar might be way ahead of the curve and understands that quick charging won't damage cells like many people believe. And internal resistance is indeed a good indicator in how fast you can charge and discharge a cell. So unless anybody has any hard evidence that xtar VC4S are damaging cells, I'm perfectly fine with their methods. In fact, I think I'll buy one now and play with it and see what I find out.
Then I ran into articles like this.
Study finds rapid charging and draining doesn’t damage lithium-ion electrode as much as thought
So xtar might be way ahead of the curve and understands that quick charging won't damage cells like many people believe. And internal resistance is indeed a good indicator in how fast you can charge and discharge a cell. So unless anybody has any hard evidence that xtar VC4S are damaging cells, I'm perfectly fine with their methods. In fact, I think I'll buy one now and play with it and see what I find out.