If my vehicles engine is turned off, how long can I safely leave the cooler plugged into my cigarette lighter socket before compromising the batterys ability to start the vehicle?
The safe answer here is approximately 3 hours in most situations. Actual conditions will vary depending upon the number of electrical devices that have been switched on during the last part of your drive (wipers, lights, blower, defogger, radio, cell phone, aux heater, cooler and or other accessories) and what driving conditions have just been experienced (high speed highway or stop and go traffic). Further limitations and factors are the relative condition of the battery and its charging system as well as season, temperature, and weather conditions. Under ideal conditions a cooler could be run for many hours on just battery power. Under the worst combination of conditions, accessories could potentially deplete the battery in 10 to 20 minutes. Some vans have 10 or 12 bulbs lighted when the interior lights are on. Just these lights can drain a battery below starting power in about 15 minutes, without any other electrical device being present. Good judgment is required when making the de
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