IPhone 5s charging very very slowly?

I've had my iPhone for 8 months now and I've never had any bother with it at all. Without any changes my phone has suddenly slowed charging rate by hours, struggling to pass 4% in 1 hour. It started when my phone charger wouldn't sustain a continuos charge and the lightning icon to represent the phone being charged would flicker on and off repeatedly.

Today I went out and bought a brand new charger in hope that it was only a fault with the original one. Upon connecting it to the wall my phone has been struggling to charge at all and I've tried it in multiple power supplies around my house.

Has anyone else had similar issues or has an idea as to what may have done this?

Switch it off and on again

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