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My (limited) understanding is that age, charge/discharge cycles, abuse (over/under voltage, not using storing properly, shorting) or damaging the pack can all lead to higher IRs. It's a chemical thing so there are probably many other things that can cause it too. However, you IR not a single...

Glad it turned out OK. I only charge outside. They are stored inside an ammo can in the garage on the cement floor and I check them every month. But I'm not paranoid. My plan was to look for an old BBQ or tool box to convert to a charging station, but everyone want's way too much money for...