Profoto 2.8A User Manual page 5

Operation
1. Connect the supply cord to the mains supply and charger. The
"power" lamp will light on solid.
2. Connect charger to the battery. The green charge level indicator
LED´s will light on flowing in sequence. If the battery polarity
reversed or output shorted, all green LED´s will be flashing, please
check the setup.
3. Depend on the charged capacity, the LED´s will lights up solid in
sequence, until the battery is fully charged (all LED´s lit). Then you
can unplug the charger and the battery or you can charge another
battery.
The charger has automatic charge stages. "Pre" is a pre-charge
function for deep discharged battery pack. When battery is recovered
by pre-charge small current, stage "CC" Will give constant current up to
16.8V. Then the "CV" stage will hold constant voltage until the battery is
fully charged and the charger enter the last stage "cut off".
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