About how long does it take you to fully charge your tablet?
In the last few weeks mine will only be at ~30% charge after 8 hours of being plugged in and I'm considering contacting Google Support.
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Don't wait too long to contact them. That should be under warranty. I have a Nexus 4 and have used the Nexus 7 as well. They are pretty solid devices.
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That sounds like an issue with the battery. I would contact support. It should be holding the charge and for a long time. I have my Nexus 7 off the charger entire days with the battery going no less then 80% idle. It is almost always charged or charging and I have no issues. I would seriously just contact support, maybe they can get it fixed for you.
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I'm not entirely sure. No more than a few hours. Have you tried different cables/outlets?