https://eu.battle.net/support/en/help/product/services/974/977/solution
This seems to fit your issue.
If you have a phone number on the account, you can do an SMS reset. If not, I guess it's "open a ticket with a throwaway" time.
I’d create a new account and then raise a support ticket that way for your old account.
Are you not able to replace the battery in them?
I tried but either age or removing the battery caused it to desynchronize. I got it right before Wrath of the Lich King, so it had a good run.
From video gaming to card games and stuff in between, if it's gaming you can probably discuss it here!
Please Note: Gaming memes are permitted to be posted on Meme Mondays, but will otherwise be removed in an effort to allow other discussions to take place.
See also Gaming's sister community Tabletop Gaming.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.