eli5 why phones drain battery even when they are turned off?

Question

eli5 why phones drain battery even when they are turned off?

In: Technology

Answer 1

As others have pointed out, batteries discharge by themselves over time, but the other side of the story is that a phone is never turned entirely off; most of the circuitry is put in a dormant state, but there is still a tiny part that monitors the off-on button.

In fact, this applies to a lot of electronics in general.