The Nexus 7 charging issue only occurs if you use a charger that can only put out 0.5A, or, more often, the Nexus can't tell and only uses 0.5A(like an iPad charger)
There are various incompatible ways for dumb chargers to indicate their power output. The one the Nexus 7 wants is the data lines on the USB cable tied together. If I use an iPad charger it will slowly discharge if the screen is on full. When I put in the extension cable I cut open and shorted the data lines together on the Nexus 7 side it charges fine with an iPad charger even with the screen on full, Wifi, GPS and Bluetooth on. There are also reports of a similar looking problem when a compatible charger is used with a low quality cable that just can't pass enough current. -Steve
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