I bought and use the energizer one you linked for my wife and my Nexus 4. As a bare Nexus 4, the energizer charger was horrible because the phones would slip -- perhaps even more so during charging.
Once we added these cases http://www.amazon.com/i-Blason-Fl...roduct_top, the phones didn't slip and the charger worked great. As for charging, it doesn't appear to charge constantly, when the phone is fully charged it stops charging and resumes charging when the battery drops a few percent.
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