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I have made a few observations on the Hummer that could use the 12V battery to die, first of all, have to remember to hit the start/stop every time when you exit, or the Hummer stays on. In our Audi it shuts itself off after a few seconds if you leave the front seat.
Second, if you keep your key FOB too close to the truck, it will initialize from time to time, draining the battery. I noticed this as we set our keys just inside the house on the counter. Last night I went out to the garage 2 or 3 times without the keys, but each time I opened the door to the garage the truck initialized, and ran through the lighting sequence, even though the FOB did not move from the counter.
Second, if you keep your key FOB too close to the truck, it will initialize from time to time, draining the battery. I noticed this as we set our keys just inside the house on the counter. Last night I went out to the garage 2 or 3 times without the keys, but each time I opened the door to the garage the truck initialized, and ran through the lighting sequence, even though the FOB did not move from the counter.