Becker GPS Navigator Operating Manual page 144

>>> NOTICE
> D
> GB
> F
> I
> PL
> Completely discharge the battery (leave the unit switched on with no power supply until it automatically switches off).
> Unscrew and remove the two housing screws
> Lever off the rear 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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using a flat-blade screwdriver (placed at the slits on the sides of the housing).
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using a small TX5 screwdriver.
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