Caution, polarity is not unique!

The cable can be connected in both directions (the Z1) - ie cable or down pointing.
Obviously if the cable is properly pointing downwards.
There are by the shape and the length of the contacts no protection against reverse polarity.

I did not know (the cable is also no guidance at) and the phone has booted / off.
The power button no longer worked.
Only a hard reset (red button in the SIM card slot), it was to bring them back to life.

There seems to damage the electronics or the battery with reverse polarity, the danger.
Bill as if I had been lucky again.