On my Lenovo laptop, running windows 7, I got a prompt saying that, the system has noticed I am mainly using adapter, therefore I should keep the battery half charged. It justifies by saying, trying to overcharge batter reduces life time.
Now, form what I understand, the battery and charger should have internal circuits to prevent attempted over charging in the first place. Then, why is there a software level prompt to set the option to "half charge" battery, if mostly running on adapters.
Answer
The reason it's that way is because that's the way LiIon batteries work. Other battery types are happiest when fully charged, but not LiIon. I'm sure the laptop manufacturers would prefer otherwise, but you can't beat physics.
If you use the laptop on mains power most of the time, you should use one of the settings (if available on your unit) to charge only to 50-80%. Should you anticipate needing to use the laptop on battery for an extended period you can (in advance) change the setting and fully charge the unit.
One note: On my Sony Vaio the system sometimes "forgets" this setting, especially if the unit has been left on battery too long and runs the battery "flat". So check the setting from time to time.
Another note: Don't think you can do better by removing the battery entirely. Most laptops depend on the battery to supply "peak" power even when running on the adapter, and thus the CPU will likely be "throttled" if you remove the battery.
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