Installation Manual

3. Place the batteries flat in the unit and close it.
4. Turn off the switch, and check the battery voltage directly on the connector at the rear of
the unit.
Preparing an external battery unit (stack version)
Before starting the installation, note that:
- External batteries must be of the same type, must be supplied by the same manufacturer
and be from the same batch run.
- Batteries must be charged prior to installation.
Procedure for 12 V stack version (for S and M systems)
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The 12 V stack version of the external battery unit can used with S and M systems. It uses 12V
- 7Ah batteries. Either one battery or three batteries can be installed in the unit.
1. Ensure that the ON/OFF switch on the external battery unit is set to the OFF position (0 or
black) and that there is no cable connected to the J1 connector (see the figure below).
2. Open the unit by removing the four screws (ST3.5x32) with a screwdriver (Phillips PH2).
3. Insert the batteries in the open unit as follows (also see the figure below):
a. Place the first battery in the middle position (battery B2).
b. If three batteries are to be used, place these batteries in the remaining positions
(batteries B1 and B3).
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