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I use two of the BlackVue B-124E batteries which are connected together. They charge up off the 12v DC plug. I prefer to keep the dashcam off the car battery (it was previously hooked up off the fuse board). I don't drive too often, but from a full charge, they have lasted about 48-60 hours parked in the basement. It runs the dashcam and a 4g hotspot.
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