OFFandON:
Is there any way to tell from hooking them up to the L298 and measuring with a multimeter what kind of voltage and current they need to operate seeing as I can actually get them to move via the h-bridge?
If the motors have a max current of 850mA I would expect them to move with a current of 750mA or so - though I have no means to test that.
I don't remember how much current the L298 can handle, but more than 750mA I think.
If you want to try the L298 you need a lower supply voltage. You have the max current and coil resistance so you can work out the max voltage with Ohms law. You may need an even lower voltage to keep within the current limits of the L298. And you also need to take account of the voltage drop across the L298 itself - they are not efficient devices.
Looking back at your earlier post perhaps you only have the specs for "similar" motors. If so, checking the coil resistance with a multimeter may help to confirm if your motors are the same.
If you intend to use the motor(s) in a project why not take a leap of faith and buy a stepper motor driver than can easily handle the full motor current. Drivers using an A4988 chip should be suitable.
...R