Xperia Z2 :: Phone Won't Charge Or Turn On But Red Light Showing

My phone was working perfectly alright last night but lost charge so went go charge it as normal from the wall socket but it did not charge at all and not even the red power light showing. Thought I'd give it another go in the morning but no, just the red light on but no power. Now it still has the red power light show up but then after about 30 mins a battery sign shows that is different to the last battery sign that it had before so was wondering if the system has updated automatically???? Turns on but shows main screen for a millisecond and switches straight off saying 0% battery even though its been charging a good while.