I've got some 18650s I started a "study" on this summer. All were benchmarked for IR and capacity. Two went in the freezer, and two in the fridge, both of these sets at 3.6V. Four more are at room temperature. Two of those are at 3.6V while the other two are fully charged.
FWIW, I have some li-ion power tool packs that aren't used much that are now over 8 years old and they're still usable. So even if you stored those mods at room temperature, I doubt they would be "dead" in a scant 3-4 years. Clfling batteried is far harder on them than just time in storage. I've seen that on laptops too. My daughter and I got identical laptops in 2016. She put a lot of cycles on hers in college and the battery in it was shot this summer. I used mine relatively little and it's still fine.
Note: If you're keeping batteries (or mods with non-replaceable batteries) in cold storage, it is essential to let them fully warm up before charging them. Never charge a cold li-ion cell! I would give them a full 24h to assume room temperature before charging.