Battery stops charging at 61%

So my battery only charges up to 61%. I've already changed the battery, let it run down to 0% and left it charging all night, flashed stock, factory reset, everything. I bought this phone refurbished. What else can I try?

Also, when charged at 61% gsam shows me the battery has 4200~4300 mV. But it goes down pretty quickly to about 45/50%.

Thanks in advance

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