Why my sony phone always on and shutdown..?

I cannect the charger my phone,I see that it light always open and charging my phone.First 15% down red light and 15% up green light.When I disconnect charger the phone is on and off.Then the sony phone open I see it's write just sony.Then it's shutdown .Otherwise it's do not completly open.So I can't understand.What is problem.What can I do it.Please solution me.Plz help me.

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It sounds as if the battery is not charged enough to start the phone, have you waited until the charge process is between 90-100%?

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