nospam
battery chargers may also be constant current (versus constant voltage in a power supply), depending on the type of battery it's designed to charge and they almost always have end of charge detection, typically ndv or temperature but can be a simple timer in cheaper chargers.

Eric Stevens
Those are cheap chargers. A good one should monitor the bulk charge time to determine the length of the absorption cycle before reducing output voltage for the float cycle.

nospam
timer based are cheap. ndv/temp are not.

Eric Stevens
"ndv/temp" - have you suddenly changed the subject away from the charging of lead-acid automotive batteries?