Battery discharges while charging

Yea, so I got galaxy s2 for about 2 years. I have some problems before so I have to fix it. I got my new battery for about half a year and replaced my usb board for about a month. I got this problem. Even tho it is charging, it still discharges. My phone battery % is 35 and after an hour, the battery percentage became 31%.

any help in this problem guys??

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