Some OnePlus devices have a "bypass charging" system. My OP8 Pro is running since 2y now as a Kubernetes node, and nothing bad has happened to its battery (yet).
replyI'm honestly curious to see if bypass charging is on, but it's been a while since I touched the device itself and it has been fine do far. YMMV
Wouldn't setting the charge limit to a really low ceiling suffice?
reply>>The problem with modern smartphones is that they run on battery, even when plugged into external power.
replyThat's not universally true - a lot of android phones have a "bypass charging" mode where you run directly from the power supply, and indeed you can run them with the battery removed.
I think sometimes playing games on the phone while plugged in would actually drain battery because the CPU just used too much power (obviously a while back when charging was lower power).
replyNot sure if those phones would work without a battery and throttle the CPU, or if they would crash.