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You need to attach the dongle in place of the removed battery if you want to ride with one battery:
https://zeromanual.com/index.php/Common_Modifications#FX_Dual_to_Single_Battery

Hello,

My rear stock IRC is now near the TWI at 11kkm. I'm considering mounting a Michelin Pilot Street Radial as others here did successfully.

However, it is unclear for me if it is safe or even legal to mix a radial tire (rear) and a diagonal tire (front).

Any thoughts?

It's not legal to mix radial and diagonal tyres, at least in Germany. But why do you want to mix? Using the IRC until worn down? Get rid of them as soon as possible and use Michelin Pilot Street, but the radial ones. They lasted longer as the diagonal ones, 12000 km the others only 7000 km. Both have more grip at cold and wet weather compared to IRC Tyres, and this is a mayor safety plus.

I use an energy saving mains socket for PCs:
http://www.ansmann.de/en/products/chargers-power-supplies/energy-saving-mains-sockets/aes3?___store=en

It's programmable to the standby consumption of the plugged in device and switches power off after 1 minute as soon as the standby draw have been reached.
Power on is via push button.

Today I got my Zero S 2013 back from a suspension specialist. It was not at Franz Racing but at Maniacmotors http://www.maniacmotors.de/fahrwerk.php because they are next to me and offer custom made rear shocks from Wilbers. Wilbers itself offers aftermarket shocks for Zero 2014 or newer:

https://www.wilbers-shop.de/index.php?cl=alist&cnid=ce486575cff2b6ffcc426f00ff9e98cb&fnc=showList&manufacturer=amu5e4136ae98d5a8327b54d6aadf5d7&year=2014&catname=ce486575cff2b6ffcc426f00ff9e98cb

But for my MY 2013 they were not able to get any suitable rear shock as the space on the 2013 swingarm is so limited. A rebuild was also not possible as they did not get spare parts for rear shock from fastace. Same for the fork they were not able to get any spare parts. Fastace itself did not reply, and the dimensions of spare parts differ from any other fork they have seen before so they were not able to rebuild fork also.

After two months sitting at their shop I have still a worn fork and rear shock. I told that to my Zero dealer and he will ask Zero if there exist new replacement fork and shocks for 2013 at least. If not it would be a end of life for my Zero 2013 far too soon.

My rear shock is hosed on my 2013 S.  I brought it to a shop, they said it would need to get shipped out somewhere (manufacturer) for a rebuild because they don't do nitrogen shocks.

They had also said I might look around at the shocks from 250cc/300cc motorcycles and see if any fit.

How do I figure out what else will fit mine?  It doesn't look like zero has an aftermarket shock for the S.

I also ride a Zero S 2013 with 45.000 km up to now. Rear shock and forks went bad. So i took my Zero to a suspension specialist nearby in Nueremberg, they are a dealer of Wilbers Suspension and will try to install a Wilbers Shock at my Zero.
http://www.maniacmotors.de/fahrwerk.php
For the MJ 2014 there already exists an aftermarket offer. https://www.wilbers-shop.de/en/Motorcycle/Zero-Motorcycles/Zero-S-Z1-M5/Shock-absorber-Type-640-Road.html?manufacturer=amu5e4136ae98d5a8327b54d6aadf5d7&year=2014&catname=ce486575cff2b6ffcc426f00ff9e98cb&lang=1
I will report and post photos as soon I got my Zero back.

We will try to rebuild the FastAce shock and forks if Franz Racing can do it.

we can ship a 3 phase charger for you to hook up as well.

Here at my location we have a 3-phase Y system power supply with grounded neutral. It provides 230 Volts each phase against neutral/ground and 400 Volts between each phase.
Can the charger operate at that power level? As the charger seems to have no galvanic isolation will the Zero handle that voltage against ground? Are the isolations of charger and Zero sufficient? Does the charger provide PFC at 3 phase operation?