>A chemically aged battery also becomes less capable of delivering peak energy loads, especially in a low state of charge, which may result in a device unexpectedly shutting itself down in some situations. In my years of experience owning smartphones, since the original iPhone, and including a Samsung S4 (decommissioned last month - purchased in 2014). I have never experienced sudden shut off from an aging battery. H…
I have only experienced it when my device was displaying less than a 15% charge. It also helps if you practice good battery management, not leaving your phone plugged in all night/day.
I also have a theory that people are damaging their batteries more if they are a heavy user, while the phone is plugged in. If your phone is charging and you are playing a game my phone seems to get much hotter than at any other time.