My Renault app battery button

Any idea what the battery button does on the my Renault app?
I have two options. A/c and battery.
I know what the a/c does, but that is just a mystery to me.

I believe it starts a charge immediately if plugged into a charger. I only noticed that it stops being greyed out when connected to my home charger but I have never used it. :older_man:

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