charging led becomes green and after unplug and plug agin he keep charging (red led)

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http://forum.xda-developers.com – i have some issue i think with my phone after im charging my phone to full getting 100% and green led then i unplug the charger and plug it in agin... the led becoming red and start another 10-15 min of charging till green then im unplug agin and plug it and its becoming red and another 10min of charging till green... this is normal?? (HowTos)