My understanding was that the concerns were related to degraded batteries having a lower voltage potential.
The hardware and software were shipped with performance optimized to the initial voltage curves of the battery. Once that voltage curve decreases slightly the device will either reboot when the processor attempts to run at a higher clock speed than the battery voltage can support, or the battery can technically keep up though begin to overheat as the operating voltage is a higher draw than the battery can safely handle.
Dont get me wrong I'm not aware of any concerns over the phone actuary catching fire like that one generation of Samsung years ago, but the degraded battery would either lead to reboots or excess heat.
The hardware and software were shipped with performance optimized to the initial voltage curves of the battery. Once that voltage curve decreases slightly the device will either reboot when the processor attempts to run at a higher clock speed than the battery voltage can support, or the battery can technically keep up though begin to overheat as the operating voltage is a higher draw than the battery can safely handle.
Dont get me wrong I'm not aware of any concerns over the phone actuary catching fire like that one generation of Samsung years ago, but the degraded battery would either lead to reboots or excess heat.