Battery Master is described as 'Need to know how long you can watch your movie on your iPod? Wanna estimate how long you can talk over your mobile network? Or some times you need to make sure the battery left is enough for finish the game play for the next level'. There are more than 25 alternatives to Battery Master for a variety of platforms, including Android, Windows, Mac, Android Tablet and iPhone. The best alternative is Accubattery, which is free. Other great apps like Battery Master are BatteryCare (Free), BatteryBar (Freemium), BatteryMon (Free Personal) and BatteryAlarm 40-80% (Free).