Now I know why my HP laptop battery bulged up. It's due to prolong overheating effect inside the laptop enclosure.
My system overheats all the time when plugged in to charge. I usually run my laptop the whole day as a desktop, using it for streaming TV and work in parralel, with and external monitor.
It's cooler if run on battery. I use "Core Temp" app to check processor's temperature.
It seems the battery charging circuit/system is setup not so efficient inside, with insufficient heat decipation.
I remember my company's Dell laptop had similar issue. The battery lasted for years when I was working in office/factory, but it then got balged up after we started WFH for just few weeks during COVID-19 crisis. I relate that it's due to always plug in to charge and under hot environment. I WFH without aircon room, and putting the laptop on flat surface without proper airflow.
Under cold environment or aircon room may be able to reduce the heating effect.
So, conclusion, most electronics spoiled due to overheating or overcooling effect.
Battery is more prone to heat damage due to electrolyte deteriorating effect.
I so far been put the laptop on a lifted open bottom platform for better airflow. Will see if there's anything else I can improve its cooling and heat decipation.
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