In addition to its function as a jump starter, the device can also be used as a power bank for mobile phones, tablets, etc., but not as a charger for car batteries.
--> By the way, I am perfectly satisfied with the CE-JS18 :-) .
No, it is certainly not a charger for car batteries. The chargers are completely different devices, no batteries and run on "electricity", i.e. 220 volts.