thin king

Battery cells need to be charged else they stay dead, the longer they remain discharged the harder to restore their life. Yet the process of charging the battery also weakens it. Thus a battery's life may be maintained to last only as long as possible.

There is a difference between powered off and switched off. When it is powered off, a very minimum of energy is used, for being ready just to boot up the phone. When it is switched off, some energy is used to perform the basic functions of housekeeping etc. and to be ready for the phone to resume full function.

In the former state the battery can remain charged for months, whereas in the latter case it may last several days.

Although most phones are made with cutoff charging of the phone battery when it reaches fully charged, phone batteries do have faults which may cause the battery to explode and catch fire causing much harm.

So, what to do and where to find the way.

As of now, I powered off my phone at night, and charge it in the morning. If the battery is below 50%, I charge it up to about 90%. The phone should not feel hot or very warm while it is being charged, that is the danger sign.