I was using Matrix 3D Cubes 3 Live Wallpaper. After going with a static background that app was a huge vampire on the battery. And it was the reason the phone was taking awhile to reach a full charge. I didn't think this live wallpaper could be such a battery hog because the wallpaper is just amazing to view on the One.
Also, I was charging my phone and surfing the net. My Battery Bot Pro app said the phone would be fully charged in about 2 hours. I'm using a longer USB/power cable than what comes with the phone so I can charge and surf in comfort. Anyway, after I double tapped the home button and closed every application running. The charge time dropped from 2 hours to 1 hour and 4 minutes. Can we all conclude that closing apps saves battery power now? The Battery Bot Pro app does an amazing job of measuring the exact time your phone will be fully charged.