Victron energy SKYLLA-TG 24/80 Gebrauchsanweisung Seite 8

There is a dangerous voltage present on some of the metal parts
inside the battery charger.
The battery charger is NOT protected against reverse battery polarity.
("+" connected to "-" and "-" connected to "+").
Follow the installation procedure. The warranty expires when the
battery charger becomes defective due to reverse battery polarity.
The on/off switch at the front of the cabinet does not switch off the
mains supply.
Disconnect the mains supply before making or breaking the
connections to the battery.
Do not use the voltage sense facility in combination with the diode-
splitter compensation. This will raise the output voltage, which
could damage the battery.
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Manual Titan