when I need to charge its must in dead mode
i can’t charge it while the phone on
How long does the phone stay on when operating on the battery only, after it has been fully charged?
If not a long time replace the battery.
Most probably the battery is failing and the charger can't charge the battery and power the phone at the same time.
Here's a video that shows how to replace the battery in the phone.
Search online for BLP615 to find battery suppliers that suit you best.
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