Chamberlain Contractor Series Manual page 33

Battery Backup
3 Charge the Battery*
The battery charges when the garage door opener is plugged into a 120Vac electrical
outlet that has power and requires 24 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.
4 Battery Status LED
GREEN LED:
All systems are normal.
A solid green LED light indicates the battery is fully charged.
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A flashing green LED indicates the battery is being charged.
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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,
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indicates the garage door opener is operating on battery power.
A flashing orange LED with beep, sounding every 30 seconds, indicates the
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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
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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.
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Battery Status LED