I called up Samsung and they said to go back to store and get exchange. I exchanged the device and my new device has same issue. Ultra power mode is supposed to give you 24 hours on only 10% of battery. For some reason Crickets Wireless Version is giving 24 hours for 100% battery. I believe its because AT&T removed the advanced battery app from there phones and Cricket wireless as an mvno was not correctly programmed . Slap and Go products.