The Mavic and Air series aren't super cheap. If this is his first drone and he's looking to save money then steer him towards the DJI Mini 4k. Its not the top of the line, but it can still get some great cinematic photos and videos.
This is very good to know. I haven't actually taken them out of the box yet so I'll just leave them unused and store them in the part of my house that is always 68F or cooler.
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...