Zoef Robot Rob MR08Z User Instructions page 78

Charging:
The mower can be charged in the charging station. The extruding poles of
the mower should be in contact with the respective paddles of the charging
station. If the mower need to be charged, the mower
will find its way to the station for charging automatically when it needs
to recharge.
The mower can be charged directly by connecting the charger to the
charger input in back of the mower.
Note:
 The charger plugs must be well connected to the charging station
and tighten the nuts;
 The battery must be fully charged before the use first time;
 The two paddles of the charging station are electrified (24V DC).
 To avoid short circuit, they must never be touched with conductor
when the charger is connected to the charging station.