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The better way to power your BlackVue dashcam in parking mode. 
Article found from Rev Magazine.

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The main electrical source for a vehicle can be argued as the single most important component, as it forms as the “driving force” to store electricity. Most of this stored energy is used to start the car’s engine, apart from providing “juice” for the radio and other parts like turn signals, headlights, fuel injectors and spark plugs. But there’s more for the battery to handle once the car is up and running; it needs to serve as a voltage stabilizer, which is vital because it has to monitor spikes in voltage. The battery handles this because the alternator takes over the supply of electricity once the car starts.
These automotive batteries perform and behave differently to regular lithium ion batteries found in smartphones. Unlike lithium-based batteries, batteries for vehicles last much longer when stored in a charged state. The instability caused by leaving it discharged most of the time will increase
the sulfation process, resulting in the build-up of lead sulfate crystals. A “sulfated” battery can lead to loss of cranking power, longer charging times, excessive heat build-up, shorter running times between charges and shorter battery life. These drawbacks explain why local car dealers utilise an external power source to charge their showroom cars.
The proliferation of external devices for cars in the local context would inevitably give rise to more usage of electrical energy. And we have to be conscious that distribution of electricity has to be kept in check at all times, because there’s always a likelihood that the electronics will go haywire once the vehicle is discharged from all “electrical duties”.
For instance, in-car video recorders such as Blackvue would need to tap on the car’s battery to enable the “Parking Mode”. This translates to the need for a more stable electrical source to handle this additional device. This is where an external battery pack comes in to provide the necessary power source, even when the car’s ignition is turned off. One of the products currently able to support dashcams such as Blackvue is the Cellink B battery pack.
So, what can it do that a car’s battery can’t? In fact, what the Cellink B battery does is to complement and take over the “duties” of the car’s battery when needed. This works well when you’re leaving your dashcam on when parked, as the Cellink B feeds electricity into the device long after the ignition is switched off. This is made possible by the LiFePO4 battery technology that supplies high energy density, without compromising on safety and consistent performance. 

Some useful features of the Cellink B include Advanced Microcontrollers (MCU) for efficient charging current and voltage and a built-in Protection Circuit Module (PCM) to prevent the cell from over charging or discharging. The device can also sense the moment temperatures soar. It can cut off once the unit reaches 80 degree Celsius.
One full charge of the new Cellink B6 takes as fast as 60 minutes while you’re driving – that’s pretty impressive taking into account that a fully charged Cellink B6 can power up to 19 hours for a BlackVue DR650GW- 2CH. And if you’re using the BlackVue DR650GW-1CH, you can be assured that it’ll last up to 34 hours – more than enough “juice” to power the device at your command.
The good news is that the new Cellink B6 can support a cigar jack connection. You can have a peace of mind when using the “Parking Mode” feature without worrying about potential complications. For example, internal wiring to the fuse box of your new car will not be affected, hence preventing the warranty void with your local distributor. Cellink B will also eliminate “battery discharge error” on the dashboard of continental cars like BMW.
Usage of external battery packs will yield positive rewards in the long run, taking into account that it also prevents the primary battery source from discharging when not in use for an extended period. We reckon that dashcams should be paired with a reliable external battery, as it would fend off potential electrical complications for your prized possession.
Credits to Rev Magazine