Visited on Sunday, February 9 without charging.
The charger is in front of the Werkhof. 2 spots reserved for charging. Parking seems to be free.
There seem to be 3 copies of the QR code for each side: one on the pico itself, one on the sticker on the pico, and one on the green sign on the wall.
Coming from Brienz, Google Maps was directing me through the fields to arrive on Rüttiweg from the south, but that's not allowed. You need to drive into the village, up Dorfstrasse and then access Rüttiweg from the north/east.