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Vehicle Jump Boxes - Printable Version

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Vehicle Jump Boxes - Darth-Apple - March 18th, 2020

I have a fairly robust jump box, but my volkwagen jetta has an unusually large ~900 CCA battery for a 2.5 liter engine. I'm often amazed at how it manages to require such a gigantic battery. It's a truck sized battery in a small sedan, with a sedan-sized engine. 

The jump box is not powerful enough to jump a dead battery, but if I only left the lights on for a few hours and it has enough to run the accessories, it provides enough boost for the car to get it started. I've long wondered if, however, leaving it connected AFTER jumping the car manages to charge the jump box. 

Google doesn't have any answers anywhere for this one. I honestly have no idea. Anyone know if this charges the jump box, or do you have to charge it only using the built in charger? Just out of curiosity on this one...