Under normal circumstances and with good care, your chemical gate motor battery should last 2-3 years
With the new Sirius 60W.h - 12Volt (7a.h - 12V battery) energy storage module
you may need to change your gate motor battery maybe once in your lifetime.
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If there is a power outage longer than 4 hours or the gate is opened and closed often during a power outage, your battery will start to run down. If the voltage falls below 10.5V you will need to replace the battery, even if it is a brand new battery. With all the Eskom load shedding we are experiencing, you may want to consider a different option.