For those practically minded, this application conveniently shows your battery life as a live wallpaper. As battery life goes down the bars will gradually disappear and the bars will start to change color. The color goes from green, to yellow, and finally to red indicating battery life is critical. The bars are accurate within 5% battery life. If you wish for more accuracy, then the text indicating the exact value of battery life should be turned on in the settings.
*Note: Some phones only display battery life in 10% increments.
battery live wallpaper life indicator background widget simple