Chamberlain WD850KEVG Manual page 33

Battery Backup
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.
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.
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, indicates the garage door
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opener is operating on battery power.
A flashing orange LED with beep, sounding every 30 seconds, indicates the battery is low.
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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
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a charge and needs to be replaced. Please call for replacement battery to allow your system to
operate during a power outage.
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Battery Status LED