Why did you remove the 12v battery on your new ZS? Just curious
When we first bought our Gen 1 ZS EV - I decided to invest in a CTEK 12 volt smart battery charger ( similar to the one in the photo below ).
It already comes with the normal crocodile clamps that you attach to the battery, but they sell a quick connect / disconnect loom for a £5 ( see photo below ).
As you can see, the loom has purpose built eye let connectors on one end and a quick connect / disconnect weather proof socket on the other.
You connect the positive eye let to the positive terminal of the 12 volt battery and they recommend that you connect the negative eye let to a main earth return post on the body shell.
When this is installed, you can quickly connect the charger to the car without using them crocodile clamps that can fly off.
Most manufacturers recommend this type of connection process for jump starting a car also ( If they have the facility.)
You could connect both eyelets direct to the terminals if you wanted too, but this not reccomended by CTEK.
One of the main multi earth / grounding posts for the ZS EV ( Gen1 & Gen 2 ) is located right behind the battery on the N/S/F suspension strut mounting, right behind the battery.
Removing the nut to install the eye let is difficult with battery still in place, so I removed it.
When we sold the Gen1 - I removed it and installed it on out Gen 2.
That is the full back story !