So what did I find in my EV-charger wifi-card?
Basically, it is a raspberry pi.
The SD-card contains goodies, like a private ssh-key that apparently gave me access to their jumphost (no restrictions in their shell either).
The NTP was also not configured, it also contained the entire bash-history, including all the "failed commands" and apparently a password to something.
I guess I'll spend some time on the phone tomorrow