It appears that even most Linux users will admit that battery management in Linux is bad. - https://www.reddit.com/r/linux/comments/1gtgpkb/does_linux_have_better_battery_management_that/

Battery management related factors in which off-gassing can occur:

  • Overcharging: Excessive charging can cause the decomposition of electrolytes within the battery, leading to gas generation.
  • Overheating: Like off-gassing, excessive heat can trigger thermal runaway by destabilising the battery’s internal chemistry.
  • Over-discharging: Discharging a battery beyond its recommended limit can also result in the release of gases.

https://www.crowcon.com/us-en/article/battery-safety-what-is-off-gassing-and-why-does-it-occur/#%3A~%3Atext=Off-gassing+refers+to+the+release+of+gases+from%2Cof+internal+components%2C+causing+the+release+of+gases.

If you insist on using a Linux on a laptop or portable device, consider: How to optimize laptop battery life with TLP on Linux

How to remove a swollen battery from a laptop