Quote:
Originally Posted by Clearlink
It has a battery backup in the control box. Usually 9 volts
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Quote:
Originally Posted by rogerk
The battery back up works but the battery does need to be changed. I replace it at the same time as I replace the smoke detector batteries and the battery in the garage door opener outside the garage.
Very cheap insurance! I got stuck once no key and a dead battery in the remote. The car was in the garage.
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My Hunter Pro-C controller has an optional 9 volt battery, but the only thing it will do is to allow you to program the controller. It cannot be used for watering, and it is not even needed to maintain the clock and calendar settings. Apparently, the only reason for it is to allow the builder to set the watering schedule without house power. Here is the Hunter explanation from their manual:
"Connect a 9-volt alkaline battery (not included) to the battery
terminals and place in the battery compartment in the front
panel. The battery allows the user to program the controller
without AC power. Watering will not occur without AC power.
Since this controller has non-volatile memory, the program clock
and calendar will be retained during a power outage even if no
battery is installed."