It is current that recharges batteries, so a charger capable of providing a higher current will charge a given battery faster. For Lithium batteries, a constant current is required, so the applied voltage will change as the battery charges to maintain a constant current.
Heat is what kills batteries, and faster charging at higher currents produce more heat.
It would follow, then, that the maximum temperature would come from the maximum current - and thus, for a given amount of charge of a given duration of time, the minimum temperature would be attained by minimizing the maximum rate of charging - by making it equal to the minimum rate. IOW, constant charge rate.For Lithium batteries, a constant current is required, so the applied voltage will change as the battery charges to maintain a constant current
Everything is clear. The voltage listed is not what appears at the terminals - the voltage applied to the terminals is whatever it takes to produce the nominal current.A current source, rather than a voltage source.