Battery charging very slow

Hi guys for last 2days my phone is acting abnormal like it take more thn 12 hours to charge battery to 100% and if I use phone while charging it starts to discharge battery I tried some stuff like holding power+volume up+volume down for two minutes and I tried 15 second light sensor under direct light I am not sure if it is my battery or my charger that is malfunctioning please tell what should I do to verify what is the problem and are some GSM battery shots Attachment 3443393Attachment 3443394Attachment 3443395

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