Can a motor that says ac only be powered by a battery?

Question

are there any batteries that produce alternating current?

could i put in a little alternator?

Answer 1

It is possible but it will all depend on the size of the motor

There are no batteries that  produces ac unless an inverter circuit is inserted to have ac at the output

Answer 2

no and no and no

What voltage AC?  you can get inverters that will convert 12 volts DC to 120 VAC or 240 VAC.

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Answer 3

no

Answer 4

Technically YES, an AC motor can be powered where the only power source in the system is a battery.  Nevertheless there are no batteries that directly produce voltage via alternating current (AC); all are direct current (DC) .  

"In the field of electronics, a battery is two or more electrochemical cells which store chemical energy and make it available as electrical energy."  This electrical energy production is a fairly consistent flow of electrons, not an alternating flow as would be found in an AC power source.

A special circuit is needed to convert DC to AC power called an inverter.  Some devices claim to be an AC battery but are instead a device comprised of a battery and an integrated inverter circuit.  An alternator as you mentioned wouldn't work since it is actually a device that converts mechanical energy to AC electrical energy.