Battle Energy (File:Battle Energy.png) is a new addition in Bloons Tower Defense Battles. The player can also spend File:Battle Energy.png2 to use the Spy Ability to see what towers your opponent is using, and by spending File:Battle Energy.png1, you can either roll a random tower (iOS), which will allow you to use towers you have not unlocked, or use a 5th tower (web). Every 12 minutes, File:Battle Energy.png1 is replenished, even when the game is closed. A bug can prevent energy recharging until you reload the page.