Thanks for your answer!
I am looking for an automotive unit.
Now I have a 10+years old Nüvi 200. This is a superb unit, I can use openbike maps on it.
Original battery is replaced to a changeable battery. hoewer this samsung 18650 cell is 3500 mAh, and one battery works more than 8 hours continuously.
The only problem: It does not handle the uploaded route function...
Spoiler: large images
BUT I found this:
[Only registered and activated users can see links. ]
Here we can see a lot of units compatible with this option.
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