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Bringing it up to operating temp is just the coolant, oil takes a long time (a 20min drive) to warm up. Pull the battery out and put it on a trickle charger if you are not driving the Z. Much healthier for the engine. The alternator is not designed to charge a dead battery, just maintain a charged battery. Also at idle it is not putting out many amps. You probably were using more of the battery to start the Z each time than it charged it back up. I would pull the battery out, get it tested, charged and keep it on a trickle if you are not driving.
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