Interesting article. What about charging of laptops? The manual for the Acer Swift 3 (Thanks for the recommendation, @mevinyavin) says
In addition, the useful lifespan of the battery is adversely affected by the following usage patterns:
• Using the computer on constant AC power.
and a few sentences later, to optimize battery life:
You are advised to follow the suggestions set out below:
• Use AC power whenever possible, reserving battery for mobile use
Aren't these two sentences contradictory? What am I missing?
They are definitely contradictory.
I cannot speak for Acer, but here's my take on battery usage for laptops in general.
1. If your computer is rarely used on battery OR your battery life is way more than you need, activate a battery saver option that caps the charge at 80 or 85%. This will extend the life of the battery. (Where this option is located varies. Google it or check the company's support page.)
2. If you occasionally or consistently run the battery down to 0, don't do that. When it is convenient, charge the battery back up to avoid running it down completely.
3. Don't fret about using it off the plug if at all convenient (despite what Acer says). Prioritize AC use only over running the battery down completely.
4. Although it is true that running the battery down completely is "bad" for the battery, it isn't SOOO bad that it is worth driving yourself crazy. Chazal say, "Better to use the crystal goblet and have it smash than never to use it at all." Replacing the battery isn't so terrible if you get one from the company.
5. Use AC power whenever possible, but make sure the computer can breath when charging. The heat is worse for the battery than the full charge. In any case, when the battery is full, it is designed to stop charging. Either way, it is better for the battery to run it on AC than to charge it down...