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Hi
I am not saying that your battery haven't internal failure but definitely dropping 5% in 15 minutes can't indicate this.
Please perform factory reset, charge battery to 100% and reboot. Then test how long will last of normal using condition.
When your phone will be under second charging you can go to settings - battery and check screen on, Wi-Fi, calls, etc.
You can take screenshot of this details and provide here then I can look on this.
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