Good bit of kit compared to old lead acid battery boosters but remember that it is just that - a booster. I don;t think it will start car on it's own if battery is totally flat. Those cables look very thin and I don't think they can carry 800A without significant voltage drop and heat. I have a lot thicker jumper cables that will not carry enough current to start 4.2 if battery is flat but they are a lot longer as well so that's a factor. It does say peak current 800A but does not say for what amount of time, is t it 1 second or 0.0001s? DC output it only says 15A. As it is lithium battery the voltage will be 14.4-14.8V so even with flat car battery it will be pushing some juice in car battery so if it does not start straight away if you leave it connected for 10-15min it will get some charge in car battery and then you should be able to start combining power of both.
It would be interesting if anybody could try it with totally flat car battery or car battery removed all together.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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