Battery charging and battery life

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http://forums.androidcentral.com – i am in a great dilemma concerning this now. So basically, when my battery on my nexus 10 reach about 12% i plug it in the ac and within 6 hours its completely filled. Last night i plugged it in same thing, but instead of being completely charged, it was at only 48%. is my nexus 10 battery failing or something? So maybe this could have been the source of the problem, i had a 720p video running on mx player in the background. Basically, what is the normal amount of charging hours and what is the battery life when fully charged? Thanks so much (HowTos)