About Battle.net Balance Card Gift Card EU Battle.net registration required. Note: Battle.net Gift Cards can only be redeemed into Poland registered user accounts. Load up your Battle.net balance, then use it on Blizzard Entertainment games, character services, in-game items, and more. Battle.net balance is simple and convenient to use. Use Battle.net balance to buy World of Warcraft realm transfers and other paid services, as well as digital versions of Blizzard games like Overwatch, Hearthstone, Heroes of the Storm, World of Warcraft, Diablo III and StarCraft II. You can also use Battle.net balance to buy items in games like World of Warcraft and Hearthstone.