Since I got my Droid 4 a few days after they were introduced in the US, I've been very careful to avoid keeping the device on the charger after the Battery % indicator (I charge in "sleep" mode) reaches 100%. My question: Is this an unnecessary precaution, or does the Droid 4 have circuitry to prevent overcharging? For what it is worth, I'm satisfied with my D4 battery life thus far. I have mobile hot-spot enabled, and if I know I'm going to use it for an extended time, I plug is (as recommended by Motorola); however, for a brief period (<15 minutes) I don't bother. As best I recall, the only time I plugged in was when I watched a movie on my iPad 2, using WiFi to my hot spot to get to the internet. With headphones, it was a somewhat satisfying experience, but, alas, no competition with my HD TV.