I always liked RTH; it's a great feature. But, you need to make sure your take off point and area within about a 50-foot diameter circle have very clear and distinguishing marking. A clear area without such marking will complicate the landing...
I've been on this site for four years. I've been flying since the Phantom 1. I am quite good at flying and landing. I use RTH because I just want to sometimes. Is that ok with you?
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"