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1. I've noticed that most car electronics will work down to at least 9 volts.
2. Once I had a dead alternator. I would plug the battery into a charger overnight and then drive to and from work with no problems. Even into the night using the headlights. Each day I drove about 50 miles. Did this for about a month until I had the time to fix the car.
3. I think you are onto something here but the savings will be small but still worth going after.
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