@advocatux From the article you linked.
"That old saw about how you always need to charge you battery all the way up, and use it until it's dead? Memory effect, as it's called, affects NiMH batteries but it doesn't apply to your phone. In fact, you're phone's battery hates when you do that. Similarly, lithium-ion batteries don't need to be "calibrated" with a full charge and a full discharge when they're new."
"A lithium-ion battery typically charges in two stages. First comes the process called constant current charging."
"When the battery is 70 percent recharged, the procedure changes and flips over to constant voltage charging. During this second stage, the charger makes sure that the voltage—that is, the difference in current between the battery and the charger—stays the same rather than keeping the current constant. Practically, this means that as the battery gets closer to full, the current the charger sends into it decreases. As the battery gets full, the rate at which it charges slows down. Once you reach 100 percent, the charge simply trickles in, just enough to account for the tiny, tiny bit of charge your battery loses naturally over time."
Anyway, the 100% charge the battery until the icon becomes white is not exactly correct. Usage of the energy depends on how much the apps use them, over time. Apps use the energy they need, disregarding the level of energy in the phone battery. And a mobile phone sleeps most of the time.
Finding a fresh, new OEM Li-Ion battery for our few years old phone is pretty hard -- out of production for a year or two.