I wouldn't keep a mod in a fridge, there's moisture in the fridge.
Integrated battery mods are a problem in a vapocalypse scenario. People in this thread that bought integrated mods in 2019 when they were too cheap to pass up have expressed plans to use them now while they are still usable. That's the best strategy with these mods IMHO.
I’ve been using two aegis minis with built in batteries since they first released them when I did a review on it.