Opener beeps or flashes and will not operate; red STATUS LED flashes 15 times on battery-backup models.

Safety first: Disconnect AC power before servicing the battery. Batteries can leak; wear gloves and eye protection if corrosion is present.

Steps:

• Locate battery: On Genie battery-backup models, the battery is usually in a compartment on or near the powerhead.
• Inspect connections: Check the battery harness for secure connections and corrosion. Clean terminals with a baking soda solution if needed and dry thoroughly.
• Check battery age: Backup batteries typically last 3–5 years. If older, replace with a genuine Genie replacement battery of the same type and rating.
• Test operation: After replacement, plug in the opener and allow the battery to charge. The error should clear automatically.
• Board issue: If a new battery does not charge and F15 persists, the charger circuit on the control board is likely failed; replace the Genie control board.