The percentage is based on voltage for lithium batteries. Old or weak batteries will suffer voltage droop when under load, so the device is powering down to protect the battery from over-discharging and causing damage (or a thermal event).
this post was submitted on 08 Sep 2024
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The battery is probably about to die or is in a bad state. I doubt it has something to do with software.
Google also won't void your warranty for using a custom ROM. UNLESS you somehow brick your phone or cause permanent damage with root.