As it was announced previously almost two months ago, Balance has now been added and is live! Balance is a new feature which allows players an alternative way to purchace Blizzard digital products and services directly through their accounts. Players can use a variaty of payment methods, and is free to increase their Balance. The balance can be used towards Blizzard Entertainment products and services like World of Warcraft game time; paid services, like character name changes, and realm transfers; digital versions of select Blizzard games, including Diablo II and StarCraft II; and in-game pets and mounts.

Soon, players will also be able to use Balance for digital World of Warcraft Battle Chests and WoW digital upgrades. With the upcoming launch of Diablo III, players will have the option to use their balance to buy and sell items in the game’s currency-based auction house.
For more information, go to Balance FAQ, or go to the Balance page in Account Management to manage your balance.