Why my phone is unable to recharge unless it is switched off?

Hi @dagnebelete

How long does the battery last when using the phone, if the battery is first fully charged by having the phone turned off?

If not that long, perhaps the battery is failing and the charger can't handle both, running the phone and charging the battery at the same time.

I suggest that you change the battery and then check if it works OK.

Here's a video that shows what to do.

Search online for EB-BA705ABU to find battery suppliers that suit you best.

If doing this yourself seems too daunting, contact a reputable, professional mobile phone repair service and ask for a quote to replace the battery.