Comment by reliablereason
2 days ago
The laptop batteries tend to go bad(either just stop working or expand and become a major fire hazard) after a year or two as they are not built to be fully charged for years on end. I tried doing it twice and that is what happened both times.
Would not recommend; if you want a UPS just buy one, the small ones are not that expensive, like 70 USD.
On my ThinkPad T430, I have a weekly full discharge cycle set up using "tlp recalibrate BAT0", it helps avoid that issue and helps confirm that the battery is still functional.
On Thinkpads tlp(8) can set a maximum battery charge threshold of 80%. The embedded controller takes care of it. Never had problems.
Makes batteries live way longer.
After a year or two is exaggerating - it's rare to see issues within 5 years.