IPhone 5 loosing battery while charging?

Please please help so I was charging my phone and using it and it was like at 33 and when a minuet later it's 32 please help this is important and I don't know what's going on i have using it many times whole charging is that wrong? Please answer

That is because the cable was damaged.
change the wire of the charger… The data cable.
Happened once to me…

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