Any new-ish laptop, tablet, and phone automatically manage the battery properly. If it’s plugged in and doesn’t need charging, it’s not going to continue to try and charge it.

Batteries have only a finite number of power-cycles in them. The more you use it, the sooner they will be at the end of their service life and need a replacement.

The deeper you discharge them, the sooner they will need replacing.

Each time you fully discharge a lithium ion or polymer battery it loses a bit of capacity. So the more you work it, the more it loses the ability to work.

So towards the end of their service life where you would be able to have all-day power on your phone or tablet, you’ll find that it runs out of juice much earlier than it did when it was new.

Think of a car… you don’t always drive around with the engine at the red-line. That would use way too much fuel and drastically shorten the service life of the engine.

A battery like anything else, gets worn down by use. The less you use it, the longer a service life it will have. They only have so many cycles in them before they are no longer useful.

Lithium-ion and Lithium Polymer batteries do NOT experience “memory” issues like older battery technologies. You do not need to deplete them fully before recharging. (This actually makes them die quicker)

If you want your battery to be good to go when you need it, then always plug in your devices when you can.

Unfortunately there are so many persistent myths (that were true but on yester-year’s technology) that people still adhere to today that actually shorten the lifespan of current generation batteries.

Many online references are intentionally misleading as they want your batteries to die sooner so you have to buy more replacements.