no dice
Because the car battery output is direct current, portable audio charging is using alternating current.
If you rush to use the car battery to charge the sound, it will damage the sound.
You should know the difference between direct current and alternating current. Alternating current is the electricity used in factories or units, at home, is the electricity emitted by power plants, through transformers, to turn the voltage into the voltage we need. The two kinds of electricity are different in nature and use.
Direct current is the power that passes alternating current through a rectifier.
Of course you can! It is just that the power supply on the car is relatively small, charging may be slower, it is recommended to buy a cigarette lighter plug on that charge will be much faster, and support fast charging.