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One thing I've noticed on my parents car, if someone leaves a cheap charger in the 12V always on socket, it can discharge the battery in about a week. I suspect these cheap chargers use a simple voltage divider circuit to make 5V usb power, and constantly drain the car.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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