Backup battery indicator flashing; E11 or battery icon error on control panel

Safety first: Unplug the opener before opening the battery compartment. Observe polarity when handling batteries.

• Locate battery: Open the Skylink opener’s battery compartment (usually on the side or back of the head unit). Identify the 12V sealed lead‑acid or proprietary Skylink backup battery.
• Check connections: Ensure the battery spade connectors are firmly attached and free of corrosion. Clean contacts with a dry cloth if needed.
• Replace battery: If the battery is more than 3–5 years old or visibly swollen, replace it with the correct Skylink backup battery model.
• Inspect fuse: Some models include an inline fuse for the battery circuit. Check and replace with the same rating if blown.
• Test after charge: Plug the opener back in and allow several hours for charging. If E11 persists with a new battery and good fuse, the charging circuit on the Skylink main control board may be defective.