probst STONEMAGNET SM-600, Operating Instructions Manual

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[6] RESCUING DEEPLY DISCHARGED BATTERIES
When the charger is connected to a battery, it will detect the voltage of
the battery automatically. If the voltage is within a range of 7,5V to 10,5V
then the device will change to pulse-charging mode. This pulse-charging
cycle will only stop when the battery voltage reaches 10,5V. Once it
reaches this point, the charger will revert to the charging mode initially
selected by the user. Depending on the condition of the battery, this will
improve the charge acceptance of a fully discharged battery.
[7] SAFEGUARDS AGAINST BAD CONNECTIONS
The charger will remain in standby mode in case of short-circuit, battery
voltage below 7,5V, open circuit, or reverse polarity connection of the
output terminals. In case of reverse polarity connection the LED (!) will
signal the error.
[8] TEMPERATURE PROTECTION
If the charger becomes too hot for any reason during charging, the output
power will be reduced automatically to protect itself against any damage.
This may lengthen the charging cycle.