Battery Drain Analyzer does not display which app is draining your battery, but it gives you the percentage of battery draining every hour. Every time your battery drops by one percent the battery drain analyzer will wake up from sleep in order to save the time and the state of the battery. From the next percentage drop, the battery drain is computed. This app shows the battery status in the notification bar along with the battery life statistic for the last 30 days. It makes estimation as to how long the battery will last and how long it will take to charge.