Comment by mkesper

1. Improve longevity by charging Li-Ion only up to 85% of marketed capacity (can be configured at least on Thinkpads).

2. Open up the laptop and check if battery is swollen. After about 10 years, it's also a good idea to replace the CMOS battery before leaking.

3. Without opening, sometimes keys/trackpads don't work anymore as expected. This might be due to swollen battery packs (we had several Dells where this happened).