Yes, you can charge your car battery with a 12V adapter. There are a few things to keep in mind when doing this, however. First, make sure that the adapter is rated for the amperage of your car battery. If it isn't, it could overcharge the battery and damage it. You can charge it with a 12V adapter. Just follow these simple steps: 1. Hook up the positive (red) lead from the adapter to the positive terminal on the battery. 2. Hook up the negative (black) lead from the adapter to the negative terminal on the battery. 3. Plug in the adapter to an outlet and turn it on. 4. Your 12v adapter would only be able to raise the battery voltage to 12v, but to charge a car battery fully you would need to raise the voltage to 13.8v. The 16v adapter would raise the voltage too high and could cause damage. .

charge car battery with 12v adapter