A car battery needs a charge of 12 volts to start. The amount of charge that a battery can hold depends on the size of the battery and the number of cells. A typical car battery has six cells, each of which can hold a charge of 2 volts. So, a fully charged car battery will have a total charge of 12 volts.
Can a 12 v power supply charge a car battery? As discussed, In theory, a 12V power supply can charge a car battery, although this wouldn't be the safest or most efficient way to do it. In practice, you need more than 13V to charge a nominal 12V car battery. The charging source can become a sink if you charge a battery with insufficient voltage.
13 comments. Best. Add a Comment. markus_b • 3 yr. ago. There are USB C trigger circuits to make the UBC power adapter output 12V. But to charge your lead acid battery you need 13.8V not 12V, so this will not work. There are USB PD adapters who can output an arbitrary voltage, but they are rare.
There is a rumor unspoken rule : the slower charge the better battery, it seems charging current is around C/10 and
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.
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charge car battery with 12v adapter