How to fix XOLO Era 4k charging problem?

I have a XOLO Era 4k but it was charging till 21 ℅ then it stucks on 21 only hence not increasing using original charger that came with phone ? Does it is phone problem or charger ?

Hi there. Try to drain the battery. Once the phone is off, charge it and only turn it on once it is full. Let me know if that works.

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