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I was really bad about my kit kat update this weekend. I unplugged my Razr M at 6:00 AM on Saturday. Only used the phone for 10 minutes and yet the battery was drained by noon. Same thing happened on Sunday.
After lots of searching I found one posting that solved my problems. No idea if this is the problem for other people.
Go into wifi-settings. Then go through the list of networks that your phone has stored up and click on each one. When the details screen pops up, click the "forget" button. I deleted 20+ wifi profiles leaving only my home wifi and my work wifi in the list.
I also then went into the wi-fi advanced settings and checked on the box labeled "Avoid Poor Connections". I'm not sure if this makes a difference or not.
The day after making these changes, I unplugged my phone at 5:30 AM and at 8:00 PM it still had battery power. Today I unplugged it at 6:00 AM and haven't used it yet. It is now nearly 2:00 PM and my battery is at 68%.
