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[ame="http://www.amazon.com/Blackvue-Power-Magic-Pro-Prevention/dp/B008B8ERIO"]Amazon.com: Blackvue Power Magic Pro Vehicle Battery Discharge Prevention for Parking Mode: Car Electronics[/ame]
normally, you don't want your accessories to have power when the car is off since it could lead to a dead battery.
another way is to get an external power supply and have it hooked up to your accessory port so it charges when the car is on. then your dashcam will use that power when the car is off.
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