Each time you fight a battle you expend 1 Banner. You also recover 1 Banner each hour. There is a set Cool Down (CD) period after each battle during which you cannot fight another battle.
You will also be granted 1 free battle (Farm, Mine, Attack, Campaign and Conquer) every day at 08.00, 12.30 and 19.00. When you upgrade your City Hall you will receive an additional Banner. Banners may also be purchased using Gold once the player has bought a required amount of Gold. The more Gold you buy, the more Banners you can purchase.
Banner Cool Down: Similar to Construction Cool Down in that its duration will increase as the player fights more battles. All Cool Down times are removed everyday at 05.00. Also Battle Cooldowns are longer around Elite Resets.