My usb cable broke and I couldn't charge my wiz for about 1 month. I didn't turn it on after the cable was broken and the battery was full. When I finally got a replacement USB, I fully charged the WIZ and when I used it, the battery didn't last longer than 1.5 hours on low brightness. I tested it with the GMU music player on a full charge and the screen off, and the battery lasted 2 hours only. WTH happened to my battery, it used to last 8 hours on the GMU player???!!!