alt Hacker NewsImagine Lenovo refusing to service your ThinkPad because you've compiled your own kernel.
Charging IC has NTC thermistor and battery absolutely must withstand the system running on 100% and then some.
As for battery lifetime, batteries are cheap, unless you glue them to an expensive assembly and force people to replace whole assembly as phone vendors do.
Laptop manufacturers are most definitely not designing their laptops to run at the top of the thermal envelope for 100% of the time, and honestly that's probably the right choice because no one does that – that's what you pay for when you buy high end servers, and the fact these corners are cut is why consumer hardware is so much cheaper.
If you run the software they provide and their guardrails aren't strict enough, that's clearly a warranty case. But if you modify the software to remove their guardrails, it feels reasonable that they can deny a warranty fix.
Overclocking is perhaps a clearer cut version of this – it's a "software change", but can affect the hardware lifespan.