LiftMaster 8550W 8550W Owners Manual - Page 29

Battery Backup* Charge the Battery Battery Status LED The battery charges when the garage door opener is plugged into a 110Vac electrical outlet that has power and requires up to 72 hours to fully charge. A fully charged battery supplies 12Vdc to the garage door opener for one to two days of normal operation during an electrical power outage. After the electrical power has been restored, the battery will recharge within 24 hours. The battery will last approximately 1 to 2 years with normal usage. Instructions for replacement are provided with the battery. To obtain maximum battery life and prevent damage, disconnect the battery when the garage door opener is unplugged for an extended period of time, such as a summer or winter home. NOTE: When the garage door opener is in battery backup mode the garage door opener lights, Timer-to-Close, and Remote Close features are unavailable. * If applicable. GREEN LED: All systems are normal. l A solid green LED light indicates the battery is fully charged. l A flashing green LED indicates the battery is being charged. ORANGE LED: The garage door opener has lost power and is in battery backup mode. l A solid orange LED with beep, sounding approximately every 2 seconds, indicates the garage door opener is operating on battery power. l A flashing orange LED with beep, sounding every 30 seconds, indicates the battery is low. RED LED: The garage door opener's 12V battery needs to be replaced. l A solid red LED with beep, sounding every 30 seconds, indicates the 12V battery will no longer hold a charge and needs to be replaced. Replace the battery back up to maintain the battery backup feature. NOTE: The Battery Status LED is most visible with the garage door opener light off. Battery does not have to be fully charged to operate the garage door opener. Battery Status LED 29