If the rear air suspension is leaking it will trigger the air pump to come on and discharge the battery. You'll need to replace the leaking air bag although after several attempts to re-inflate the leaking bag it will simply stop re-inflating and the rear of the vehicle will sag until you turn off the ignition switch and restart.
You will have to turn the air ride system off until the bag is fixed. Otherwise the pump will run continuously trying to fill the bag. This will obviously kill the battery.
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