Becker TRAFFIC ASSIST Z217 - Manual (Page 138)

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>>> NOTICE
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> Completely discharge the battery (leave the unit switched on with no power supply until it automatically switches off).
> Remove the two rubber covers
from the screw holes.
> Unscrew and remove the two housing screws using a small cross-slot screwdriver.
> Lever off the rear of the housing using a flat-blade screwdriver (placed at the slits on the sides of the housing).
> Pull out the connector of the battery connecting cable .
> Remove the battery .
Note:
Do not reconnect a unit that you have opened to the power supply.
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