Nexus 7 won't charge

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http://forums.androidcentral.com – For for a while our 7 wouldn't charge properly, and we found it was due to us using a extended USB, or so we thought. Since we went back to using the standared cable its been fine, but a few days ago it started slow charging again. It charges very slowly, to the point that it pretty much needs to be on the charger all day if you want to get any use out of it. At best it charges at about 5% per hour. If you use the nexus while its on charge, it will start dropping. If its left on charge over night it will get to about 70%, even if you switch it totally off. We've tried another genuine Ne (HowTos)