Schumacher BATTERY EXTENDER BE01248 Owner's Manual page 13

PROBLEM
I cannot select a 6V or
12V setting.
The red LED is lit.
POSSIBLE CAUSE
The charger is equipped with
Auto Voltage Detection, which
automatically detects the
voltage and charges the battery.
The battery voltage is still
below 10V (for a 12V battery)
or 5V (for a 6V battery) after
2 hours of charging.
(or)
In maintain mode, the output
current is more than 2.0A for
12 hours.
Desulfation was
unsuccessful.
Lack of progress is detected
and battery voltage is below
14.2V (for a 12V battery) or
7.1V (for a 6V battery).
The battery's initial voltage
is below 12.2V (for a 12V
battery) or 6.1V (for a 6V
battery) and the total input is
less than 1.5 Ah.
The battery voltage drops
to below 12.2V (for a 12V
battery) or 6.1V (for a 6V
battery) in Maintain Mode.
• 13 •
SOLUTION
No problem; this is normal.
The battery may be
defective. Make sure there
are no loads on the battery.
If there are, remove them.
If there are none, have the
battery checked or replaced.
The battery may be
defective. Have battery
checked or replaced.
The battery may be
overheated. If so, allow the
battery to cool. The battery
may be too large or have a
short circuit. Have battery
checked or replaced.
The battery capacity is too
low, or the battery is too old.
Have it checked or replaced.
The battery won't hold a
charge. May be caused by
a drain on the battery or
the battery could be bad.
Make sure there are no
loads on the battery. If there
are remove them. If there
are none, have the battery
checked or replaced.