Actually, it isn't possessed, it is a European model that has a separate battery and alarm annunciator from the factory, which is programmed to alarm if the main battery is disconnected.
To prevent the alarm from sounding, either disconnect the alarm horn or the alarm system battery before disconnecting the main battery.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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