More about Blizzard Battle.net
General information, product information and top-up-instructions.
Top-up instructions
Visit https://eu.battle.net/account/management/ and log in to your Blizzard Battle.net-account
On the right side you press the green button “Add a game key”
Fill in the Battle.net-code and click on “Redeem code”
Your balance on Blizzard Battle.net is now charged