On the OnePlus 13 with model index PJZ110, the voltage cutoff threshold can be lowered from 3250 to 2800 mV. This is done by the
module op13-battery-unlock for KernelSU. SOC recalculation is performed by the battery controller itself, without third-party apps. It is claimed to work on ColorOS 15, 16, and 17, as well as support jailbreak mode. For the user, the point is that the phone can operate down to a lower voltage than the default. This is a third-party modification, not a OnePlus feature. It can be tested on model PJZ110.