Normally, if something is stored in a battery it is stored in a form of DC (Direct Current). This is the only way I know of to actually store electricity for later use.
But, when AC (Alternating Current) is generated it can also be converted to DC.
For example, when you recharge your smarphone you are taking AC (usually 110 in the U.S) but often 220 overseas and converting it to DC at the voltage your smarphone is using. Also, all car batteries are DC even if they are higher voltage ones like you might have on a Tesla all wheel drive vehicle.
The way I understand taking battery power from DC to AC you need an alternator and enough voltage in the DC range to do this. But, it can be done like I said IF you have enough DC Voltage Available.
A Car battery isn't usually an effective way to go to AC because the voltage isn't high enough. However, most batteries to electric cars or truck likely could be converted to AC if you have the right equipment for use with electric tools of various kinds. But, you would need something like a 100 foot orange cord for doing this outside to run whatever you were running from DC to AC.
Most of the time converting DC to AC is less than practical whereas converting AC to DC is almost always practical.
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