Originally Posted by Martian

Short answer: No.

Modern laptops all use lithium-ion power cells. It's hypothetically for bad things to happen if they're overcharged, but there are multiple redundant safety features in the laptop and battery itself to keep that from happening.

A battery does have a useful lifespan and will eventually stop holding a charge no matter what you do. Lithium ion is generally about 400 charge cycles, which under typical use will give you 2-3 years. Partial discharges are harder on them, but not enough to go out of your way over.