Hey we have the same problem with tourers and commuters. Best course of action is to stay calm, show respect for their opinion, and cycle on. You'll see that same person on an ebike in a few years...if not shorter period of time. When that happens, just nod your head and say hello...and...
Called Bosch. Error 680 is real. Most likely due to a faulty battery and/or battery management system. It is going back to the dealer for some warranty work. I'll keep you posted.
Here is the situation: Received an Error 680 (it doesn't show up in a list of Bosch errors). Other things you need to be aware of: I charge my battery to capacity. I come back a few hours later and the battery is partial discharge even though I haven't ridden it or even turned it on...