My Nexus 7 literally takes hours to charge

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http://forum.xda-developers.com – My Nexus 7 battery takes forever to charge. And this is even when I use my stock cable to the wall charger. I know it takes around 3-4 hours to charge it from dead to full but for some reason mine is only HALFWAY full at the 4 hour mark and I usually have to leave it on the charger the whole night/day for it to be fully charged. I have no other defects on this product except for this one. And I never dropped it or anything and I'm currently running 4.1.2. Please help. I know I can't be the only one with this problem. (HowTos)