I used this to measure battery health and it was pretty accurate. I wouldn't trust it as a savior, but it's a good tool to warn of impending doom while charging my phone. I'll say I don't leave it overnight as most AC adapters I know stay hot with the ignition off (fear of battery drain). But if you can safely unplug and drop the box when you turn off the car, it's a lot better than a simpler charger for the same price.
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