My mobile phone battery is not long-lasting

Hey guys, I am Peter here. I am posting a problem that is minor but in this scenario, it is truly irritating for me. As we know that we are facing lockdown currently. And we don’t know the exact day when this lockdown will be over. But meanwhile, the problem is that my mobile’s battery is not performing well. It is working around half of the time. Please help me and give me a proper solution to the problem. These days the whole day is not getting passed without a mobile phone I mean it is very difficult to pass the whole day with a phone whose battery is not long-lasting.

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