'04 GTO Battery
Due to the design of the security system/computer, these batteries will be dead after 4-6 weeks if the car is not driven. I checked with a friend in Austrailia who says the Holdens have the same syndrome. It doesn't matter if the key is in or out.
You could disconnect the battery for storage, but the engine management and radio settings would be reset every time. I use a trickle charger through the 12 volt accessory socket.
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