Keep in mind that the battery doesn't reach its full capacity until after the first 5 or so charge/discharge cycles. Also, the person who said the battery was draining her screen is coming from having the original zmax. I mention this because the zmax pro has the same size battery as the original zmax, but it has a larger screen with more than twice as many pixels than the display in the old zmax. This means that of course the display is going to use more power compared to the display in the original zmax. Lastly, a lot of people use their new phone a lot more heavily in the first few days than they did with their old phone, so the battery drains faster because they are putting a heavier load on it. These are all things to consider when reading someone who says the battery is draining fast, less than 24 hours after getting the phone.