Schumacher Electric SC1355 Guide D'utilisation page 11

PROBLEM
LED is lit. The battery voltage is still
The red
POSSIBLE CAUSE
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.
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SOLUTION
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.