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fenix 5x charging but battery percent does not increase solution (overheating)

Hello,

I got my hands on a Garmin Fenix 5x unit in decent shape.

When I took it, it was 98% charged. One week later the moment for charging came (it was about 16 %).

The watch charged up to 27% and the nightmare started - no way to charge above it.

I cleaned several times the pins and also used the charging cable from my other Fenix 5X plus. 

No changes. I intentionally depleted the battery until the unit turned off. And - it charged to 5%, then stopped...

What I noticed however was that the watch was noticeable warm. 

So I came to a solution. Mounted a vent behind the unit while charging and - voila, as I write the charge is already 69% 

Indeed a workaround which allows the Fenix to be used. However: does anyone has any idea what causes the overheating in the first place?

I tried different powersources - each one caused the unit to overheat...