Activity like having brightness all the way on or depending on how much data is used, having Bluetooth on also decreases the battery, having a charger on even when over 100 percent can make charging electronic slower. It's better to have the brightness low.
Anything that uses more processing or computation power than word processing. Naturally, that refers to things such as games, videos, music, streaming video, uploading/downloading files, connection to the internet, .
