SKYTRONIC 690.368 Mode D'emploi page 7

Your microprocessor controlled unit also offers the possibility to
recondition weak batteries with a memory effect (mainly NiCad batteries)
by repeating three times a discharge/charge cycle. Insert the batteries
and hold the yellow 'DISCHARGE' button down until you hear a tone and
both 'READY' LEDs start flashing. Now the yellow 'DISCHARGE' LEDs
light up and the green 'READY' LEDs flash as follows: - 3 times during
the first discharge cycle, 2 times during the second cycle and once
during the last cycle. Thus you can clearly see where you are with the
reconditioning process. You can interrupt the reconditioning process
any time by pressing the 'DISCHARGE' button.
Charging 9V NiCad block batteries
The charging contacts for 9V batteries are located between the
compartments 1 and 2. These block batteries can not be discharged and
reconditioned as described above. They are charged by a safe low
current to prevent damage.
Duration of the charging process
The charging time is strongly dependant on the battery capacity and
condition. The table below gives a rough indication of the charging time
for various battery types:
Type Capacity
AAA/micro
same
AA/penlight
same 1100 mA/h
C 1800 mA/h
same 2000 mA/h
D 2000 mA/h
same 4000 mA/h
9 V block battery 100-120 mA/h
The following simple calculation gives a quick indication of the required
charging time: Capacity in mA/h (noted on the battery) divided by 10
gives the charging time in minutes. Thus a NiCad battery with a
capacity of 900mA/h will be charged in about 90 minutes.
Attention!
Charging time
180 mA/h 17 minutes
240 mA/h 22 minutes
500 mA/h 47 minutes
103 minutes
2 hours 45 minutes
3 hours 10 minutes
3 hours 10 minutes
6 hours 15 minutes
10 to 14 hours.