Solucionado problema bateria.
Mi bateria indicaba que estaba cargando con el conector desenchufado. He encontrado la solucion:
Samsung Galaxy S2-Phone says battery is charging when it's NOT plugged in.
I got the rudest shock when I saw that the battery was shown as charging when the charger was unplugged. I was had the phone on charge when on a long drive before this issue set it. *And the worst thing to happen was when I shut down the Samsung Galaxy S2, it never booted and had the battery charging logo flashing.Solution:The issue is with the USB port.*The center part of the USB port was touching the other sides of the port which made the device thing that the charger was connected but was in fact shorting the port
All you need to do is to use a needle or a safety pin to space the center portion else (to be done with the battery removed and phone off)Plug in the charger again and move the charger pin slightly up and down so that the charger pin would center the portion.*Problem sorted. But also ensure that you clean the port of any debris.*