LiftMaster 8550 8550 Manual - Page 27

Battery Backup BATTERY STATUS LED 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 GREEN LED: All systems are normal. • A solid green LED light indicates the battery is fully charged. • 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. • A solid orange LED with beep, sounding approximately every 2 seconds, indicates the garage door opener is operating on battery power. • 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. • 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. Please call for replacement battery to allow your system to operate during a power outage. CHARGE THE BATTERY The battery will take 24 hours to fully charge. A fully charged battery supplies 12V DC to the garage door opener for one to two days of normal operation during an electrical power outage. Once the battery voltage drops too low, the battery will no longer operate. After the electrical power has been restored, the battery will recharge within 24 hours. The battery will last 1 to 2 years with normal usage. To obtain maximum battery life and prevent damage, disconnect the battery when the garage door opener is unplugged for an extended period of time. NOTE: Door operation may be limited until the battery is fully charged. The garage door opener lights will not turn on during battery backup mode. 27