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Help HTC Loosing Battery When Charging

My HTC One M8 looses battery when it's charging. I got a new charger cable and it still lost battery. I used the iPad brick thing that you plug in the wall and it still looses battery. I don't know what this is. It only happened 4 days ago. Do I need to go to a shop to repair it? If so how much is it in the UK?
 
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