SKYTRONIC 690.368 Mode D'emploi page 8

You can remove the inserted batteries any time from the unit when the
'READY' lamp is flashing. If you remove the batteries from the unit while
the 'DISCHARGE' or 'CHARGE' lamps are lit up, you need to reset the
microprocessor by pressing twice the yellow 'DISCHARGE' button.
Self test
The built-in microprocessor can run a self test. You can activate the self
test as follows: Pull out the low voltage plug from the mains adapter at
the rear of the unit. Hold the yellow 'DISCHARGE' button down and plug
the low voltage connector back. Release the 'DISCHARGE' button. The
microprocessor is now running a test program and the control lamps
light up in following sequence: CHARGE/READY/DISCHARGE. The self
test ends with a short audible signal.
Specifications
Power supply 12V=, or 220 VAC via the supplied mains adapter.
Charging current: pulse width controlled 800mA charging current.
Discharge current: about 300 mA.
The microprocessor stops the charging process when it detects a
decrease in the terminal voltage of the NiCad batteries. In the case of
NiMh batteries, the charging process is stopped when an increase of the
terminal voltage is detected.