Battle.net Balance is a different way to buy our digital products and services. You can load up your Battle.net Balance using many different payment methods, and then use it on Battle.net games, character services, in-game items, and more! It is not possible to transfer Balance from one Battle.net account to another. However, you can buy Battle.net Balance as a gift to another account through the Battle.net shop. https://us.battle.net/support/en/article/20311