I have a 12volt DC 1500lb electric winch

I have a 12volt DC 1500lb electric winch. Can I double the winch speed if I use 2 12volt batteries in series.?
Are there any drawbacks to using 24volts to power a 12volt DC motor? I'm using this to raise and lower the rear ramp door on my enclosed trailer.
What if you just moved the attachment point of the cable on the trailer door closer to the door hinge? Then the load requirements would more closely match the winch, since

more force would be needed, but less cable would need to be taken in to close the door, thus it would close faster.

Anyway, I would first consider a mechanical solution like that, or a pulley or gear system, and/or replacing the winch with a faster one.

I would tend to advise against increasing the voltage if there's another way; nevertheless, it is possible the motor would survive the higher voltage, especially if it was used

intermittently, so it didn't have time to overheat, and if you were running the winch and the motor at a constant power. Basically, Power = Torque * Rotation Rate = Volts *

Amps. So if the torque load on the motor was only, let's say 1/2 of the 1500lb max, or 750 lbs, then the winch could turn at 2x the rate the power level would be about the

same. You would probably want to derate it even more. I forget what the rule of thumb is, either look it up, or use it conservatively.

Also, don't forget that the load will vary with the angle of the door, and with the angle between the cable and the door. For this reason, the load will be much, much higher when

you first start to close the door. When the door is nearly closed, then most of the weight will be on the hinge, and the cable will be at nearly a right-angle with the door, so it force

on the cable will be very small.