for the last 3 weeks my samsung galaxy s3 mini has been shutting down and claiming low battery, but on plugging in and recharging it is often well above the minimum (e.g. 35, 40%). I can't use facebook or the internet unplugged without this happening, and it shut down yesterday whilst I was on the phone (also unplugged). I have taken the battery out and it looks fine. I've downloaded updates on all my apps and still no change. Does the phone/battery need replaced? it is currently not functioning as a 'mobile' phone...
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It certainly sounds like a battery problem to be honest.
You might also want to try a factory reset. Have you downloaded any apps that coincide with the problems you are having?
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