iPhone 5 won't charge
Hi,
My iPhone 5 won't charge anymore. Odd thing is when I plug in a known good apple cable (it works with my other iPhone and came with it) the red empty battery light comes on but the phone won't power on. It ran out of juice a while ago. When I unplug the cable the phone shows the red empty battery and a lightning cable with a charge/lightning bolt symbol.
Before it got this bad the phone would die at around 20-30% charged. Could it be the battery or the lightning port? Or gremlins??
iPhone 5, iOS 7.0.4