I checked out this model and it looks like one of the most reliable units out there.
My only problem with it is was that I go skiing somewhere where it can drop to -40F with the wind chill. The car will sit in the parking lot for a few days and I dread not being able to start in case my Blackvue drains the battery. All the chargers I looked at had a warning that they shouldn't be kept inside the vehicle in freezing weather.
A portable one made with lithium batteries would be small enough to carry in my luggage and have enough cold cranking amps to start most passenger cars and SUVs (depends on the model, some are better).
I purchased this one, made by Anker:
https://www.amazon.com/gp/B00O1T056A-Started my 6 cylinder, 3.0L car without any issues twice and then it stopped working completely, wouldn't even turn on.
Then I purchased this one made by Schumacher. Works perfectly and has everything I was looking for and more.
https://www.amazon.com/gp/B00LQW3COW-Made from lithium iron phosphate. Longer life, safer cells and more charge cycles than lead acid
-400A, 270CCA sufficient for any 4 or 6 cylinder car
Benefits over the Clore Jump n Carry: Smaller size, keeps the charge when sitting idle for longer, LED to tell you the voltage of your car's battery when you attach the clamps, automatic overload protection so it turns off if you don't remove the clamps after starting the car, spark-free
Cons: battery isn't replaceable like the clore unit