DON'T DO THAT!!!!! Your batteries will condensate in a fridge!. Just a cool space away from direct sunlight is fine.
Keep them at storage (60%) till day of flight...use them...Re-charge to 60 and store.
You also dont want an airtight container...
I bought a USB-C charger (one battery at a time) for the MA2/MA2S (which is where you posted this question) off eBay that works well (and doesn't cost much). Search for "Fast Charger QC3.0+ Battery USB Charging Hub for DJI Mavic Air 2S /Air 2 Drone"
Your privacy concerns are exaggerated.
Leaving the flight records on the controller won't compromise your privacy.
There is no periodic servicing needed, so you'd only be sending your drone in for crash repair.
The service techs wouldn't care...