Since there is no covered parking where I work. They won't let me plug in and I know it helps with keeping the batteries cooler when it is plugged in. I went out and bought a Car Umbrella. Last Friday It was 120 degrees inside my car. When I got to work Monday morning I installed it on my car. When I left work it was only 100 inside. I figure this thing will help with keeping the batteries cooler.
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