Pro-User DFC900 Manuel D'instructions page 6

Step 3 – Press the "START" button to begin charging the battery.
Battery Fault – A few seconds after switching on to the operating mode, the LED
indicator "FAULT" will illuminate if the following occurs:
A. Low battery voltage - < 3 V
B. High battery voltage - > 15 V (12 V battery)
C. Battery short circuit or battery cell short circuit
Under these conditions, the battery charger will stop charging. In the event of A, B or C,
the battery may be defective and we advise you to consult your nearest battery service
centre.
When the LED "FULL" illuminates, the battery is completely charged. The battery charger
now switches to the Float mode and doesn't require your attention until the next time it
is used. The DFC900 battery charger will automatically maintain your battery.
6. When charging is complete
Switch off the mains supply, unplug the charger, and disconnect the leads from the
battery posts. Inspect the liquid levels in each cell and top up. If necessary, using the
correct fluid. Replace the caps. Any surplus fluid around the cell tops should be wiped off
(this should be done with extreme care as it may be acidic/corrosive).
Where appropriate, if the battery has been removed for charging, replace it and
reconnect the cables.
MAINTENANCE AND CARE
It is essential to keep your battery regularly charged throughout the year, especially
during the winter months. In the winter the effectiveness of your car battery is reduced
by the cold. Oil is thick. Engines are difficult to start and the heater, windscreen wipers
and lights are all draining power. It is at this time that batteries have to be at peak
power. If your battery is not regularly maintained and kept fully charged, it can cause
problems and a possible breakdown.
Listed are some helpful hints on how to keep your battery healthy in conjunction with
your Battery Charger.
Faulty Cells
Batteries are usually made with six cells. One of these cells can deteriorate or get
damaged. If, after several hours charging your battery is still flat, you should test the
battery. Take hydrometer readings from each cell in the battery. If one reading is lower
than the others, this could indicate a faulty cell. If necessary, get an Auto-Electrician to
check your battery. One faulty cell is enough to ruin your battery.
It is pointless to continue using it and you would be better getting a new one.
Care
Sometimes the battery may appear flat, but this could simply be dirty or loose
connections on your battery terminals. It is important to maintain the leads on a regular
basis. Do this by removing the leads from the battery, clean the inside of each connector
and terminal posts on the battery, smear the terminal posts and connectors with Vaseline,
refit in there correct positions and tighten firmly.
It is essential to keep the electrolyte level above the plates.
Note, however, that you should not overfill it, as the electrolyte is strongly acidic. When
topping up do not use tap water. Always use distilled or de-ionized water. It is important
to keep the acid level up. If necessary have it checked by your garage.