Could someone generate electricity by using a battery to spin a turbine?

no, you`d need the turbine to turn a generator, turbines don`t generate Any electricity.

 

although I can`t imagine WHY you would want to do this?

You'd get less energy out of a battery-turbine-generator system than if you hooked the battery up directly to what was being powered. There are always going to be losses.

I do have a reason. I just dont want to explain it because i think it could really work, and i dont want it stolen. But disregarding energy loss, it is possible, correct?

it is possible, possible but utterly pointless.

 

and nobody is going to steal your idea especially as there is documented evidence here that it is your idea.

It sounds like you're "big idea" is about perpetual motion. So, let me reiterate. It is possible, but it is pointless. You would get far more electricity from hooking the battery directly to what you're trying to power as opposed to a turbine.

and if you`re simply wanting to change the current/voltage type, then this can be easily done with a transformer and suitable driver circuit.