[jotm]

I ran laptops 24/7 on AC with the batteries acting as UPS for over 15 years. Granted, all of them had removable ones with 18650 cells, so no swelling.

The charging method has been standardized a long time ago - they are charged to ~96%, then cut off, if they fall below ~94% they are topped up again.

There is a significant loss of battery life if you do that for years. I used to unplug some of them and do 2-3 full discharge/charge cycles, that usually helped increase the battery life.

Some laptops use the battery as additional power when running at wattage beyond what the AC can provide.

If you want to be safe with your model, you can try removing the battery while the laptop is plugged in - it should not shut off, the circuit for charging the battery and powering the machine are separate.

I lost more batteries in storage - they still discharge, and even though the cells could be revived, the BMS won't let it recharge if it falls below a certain voltage, rendering them dead (unless you find it fun to restore them).