Sony Xperia all it does is boot for 1 second

I don't know its model and all it does is this... streamable .com/8o423
If it is not connected to the charger it does nothing at all.

The only other thing it does is if I hold Power+VolUp+VolDown (while charging) it vibrates once and one second later vibrates three times.

No sings of life if not connected to the charger. Is the battery dead?

Thanks in advance.

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