According to the manual of my K&W BC-20 charger, it does have built-in temperature compensation.
The charger and batteries should be at the same temperature for it to work properly. The charger is mounted in the car, only a few feet from the batteries, so I don't see it as a problem.
I may start doing some checks with a volt-meter and see how my resting charged voltages are compared to that chart.
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