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Blackvuo battery pack B-124X

Hi.i purchased the blackvuo ultra magic battery B-124X tow days ago .I fully charged it and when I connect it dash cam and the car is shows it is charging the dash cam in parking mode but after 20-30 minutes it stop charging the dash cams!I already put the bottun in cigarette 12v mode.i don't know why it stop charging my dash cams and the battery level shows in the app is 100% full.can anyone why this is happening and what to do.thank you a lot.


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