A couple of evenings ago, my cell phone spent 6-8 hours on the floor of my car, which was parked on the driveway. Probably at or below 0 Celsius. When I took the phone inside, it was turned off, and the battery was at 0 percent (Galaxy S10 Plus). I charged it (wirelessly) without letting it warm up (yes, I know that was probably a mistake -- I probably should have put the phone onto an electric blanket I have).

Now, when the battery reaches something like 72 percent or 75 percent, it charges normally. Below that point, it takes 90 minutes to add 10 percent to the phone's battery charge....