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Is it a myth that keeping a laptop attached to a power source causes the battery to “die?” The answer is “Yes” and “No.”
If you have an old laptop that has a Nickel-Based battery the answer would probably be “yes” but new laptops have Lithium-Based batteries and they work differently. So fully discharging and charging the battery in a new laptop is not recommended and may even be harmful.
The modern lithium battery can be charged regardless of its current percentage, given that it has absolutely no negative effect in its performance.
Having a battery fully charged and the laptop plugged in is not harmful, because as soon as the charge level reaches 100% the battery stops receiving charging energy and this energy is bypassed directly to the power supply system of the laptop.
However there is a disadvantage in keeping the battery in its socket when the laptop is plugged in but only if it’s currently suffering from excessive heating caused by the laptop hardware. Some manufacturers make laptops with small pads that raise the unit off the desktop but if your laptop does not have this feature my suggestion would be to purchase a “Laptop cooling stand” and place it under the laptop to allow the heat from the hardware to escape.
Apple iPads have a whopping 10 hour battery! Check here to find out how to save the iPad’s battery power while working plus other features.