Adding to the answer above: You should not completely discharge or completely charge a battery very often. Just try to keep the battery at 40 to 80% capacity always, because even though laptops use deep cycle batteries, there is a limit to the number of complete charge and then discharge that can be done to the battery.
The best option is to:
1. Plug your laptop
2. remove the battery when it gets to 80%
3. Reinsert the battery when you remove power source
4. Wait until it falls to about 40%
5. Repeat
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