See BLIZZARD.COM/SUPPORT/BALANCELIMITS for balance limit and other restrictions.
Use of BLIZZARD BALANCE is subject to the BLIZZARD end user license agreement.
Go To blizzard.com/code
Create a FREE Blizzard account. if you already have one, log in.
Enter the code into the field provided.
Your Blizzard Balance is now charged and ready to spend on your Blizzard Games(s) of choice.