Why does the Samsung Galaxy Core Prime beep every few seconds and refuse to charge?

This is the second core prime from Argos in a fortnight. When charging the battery to full, the first phone reached about 90% and then stopped going any higher. It also started beeping every 10 seconds or so, eating through the battery (and refusing to charge). We took it back to Argos and got another, which charged fine the first time. Now I have charged it a second time and at about 91% it stopped charging and started beeping. It's actually a phone for my tech-phobe mother and this is really putting her off! Please tell me if I can fix the phone Thanks Emma




My mom's phone is beeping ever 3 mins. Battery is not the issue



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