Battery Life: Up to 1 hour if you are lucky.
That goes for most car GPS units from Garmin.
You need to be on power in the car for it to work for a long drive.
If you are taking it for hiking forget it.
Spoiler: I would go to this map site for Bulgaria:
There are many sites that offer free routable maps the one about is just one of them.
In the setting on the 55 turn off the Bulgaria map you have and install this one and see if it is better.
Garmin City Navigator Europe NTU 2025 coverage has Bulgaria why are you not using that map???
Spoiler: Coverage of the Garmin City Navigator Europe NTU 2025
As for the problem of the wrong instructions what voice are you using?
Some voices do get it wrong from time to time.
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