The battery on my olde iPhone 5S hasn’t been holding charge now for several weeks. Last Saturday I put it on charge showing 1% and after 3 hours it still showed 1%. I connected it to a battery pack and whilst stopped on ‘banana break’ during a walk it went from 1% to 100% in a split second. I now need it permanently connected to mains charging or a battery pack or it instantly dies.
Will any old replacement battery do at a phone shop ( circa £20 I think) ? I’ll be buying a new phone in January so will keep it as a back up.
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