My batteries were dead and then I found out my alternator wasn't charging my new batteries because my 250 Ford F250 wasn't providing that information. This gadget shows me the status of my battery. I don't drive a lot of trucks in the winter and I don't want the LEDs to drain my batteries. I have the same on my boat and it was draining the batteries. I installed a switch so I can turn it off when I park for a long time. I didn't rate the accuracy because I didn't measure it. It seems correct.
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