BFT garage door opener display shows E10 and the door will not move; backup battery icon may flash on some models.

Safety: Disconnect mains power before handling the battery pack.

• Locate battery module: Open the operator cover and find the BFT backup battery pack and its connector to the control board.
• Check connections: Ensure the battery plug is fully seated and wires are not damaged.
• Measure battery voltage: With a multimeter, measure the battery pack voltage. If it is significantly below the rated value (e.g., < 11 V for a 12 V pack), the battery is likely bad.
• Replace battery: Install a new, BFT-approved battery pack of the same voltage and capacity. Observe polarity.
• Check charger output: With mains power on and a good battery connected, verify that the control board provides a charging voltage slightly above nominal battery voltage. If not, the charger circuit on the board may be faulty.