Ducati Scrambler Owner's Manual page 154

Charge the battery in a ventilated room.
Connect the battery charger leads to the battery
terminals: the red one to the positive terminal (+), the
black one to the negative terminal (-).
Important
Make sure the charger is off when you connect
the battery to it, or you might get sparks at the battery
terminals that could ignite the gases inside the cells.
Always connect the red positive (+) terminal first.
Grease screws (1, Fig 106).
Refit the battery, connect the positive cable
(2, Fig 106) and ABS positive cable (3, Fig 106) to the
positive terminal, and the negative cable (4, Fig 106)
to the negative terminal of the battery, always
starting from the positive one (+), and start the
screws (1, Fig 106). Refit the battery cover
(A, Fig 105), engage rubber band (C, Fig 105) and
tighten screw (D, Fig 105) to 5 Nm ± 10%.
Attention
Keep the battery out of the reach of children.
Charge the battery at 0.9 A for 5÷10 hours.
152
If the motorcycle must be jump-started in an
emergency with an external starting device, it is
possible to connect the external device to the battery
without removing it from the vehicle. Connect the
external device positive pole to the battery positive
pole and the external device negative pole to the
battery negative pole.
Attention
When connecting the external device to the
poles of the battery fitted on the vehicle, pay
attention not to touch other metallic parts of the
vehicle.