If you're still within your one year warranty period I'd go to Warranty Dept first. No harm in asking. Batteries should not go bad that quickly.
If that's not an option, I think Ro-Mac is the company who handles everything with the garage door openers. At least they did for our previous house in Duval and current house in Bonita. They're also the company where you can purchase the remote keyless entry pads for the garage door.
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