AC vs DC motor?


OK...I am getting more and more interested in a new turntable and tonearm so will be coming to you all for advice and direction. I have a VIP Aries with the 10.5 arm and a Heilkon cartridge. I am interested in a Teres or Gailibier but both have DC motors. Please tell me the advantages or disadvantages of this type of motor.
rwd
Thanks Dmailer!! Now were getting someplace! Anymore?

P.S. How did you know the battery was dying? Does it have an indicator light?
I replaced the battery when I noticed that it was not taking on a full charge. The power was depleting rather quick after a charge. It was still working when I stopped using it but I decided to get a new one before it gave out completely. I bought a Vector 450 amp jump starter and it works just fine. A fringe benefit is that you can jump start your car with it if need be.
The old battery had a VU meter. My current one has lights showing the level of charge. As far as use, I leave charging during the week and only unhook from charging when I play music. On weekends when I listen to more music I leave unhooked from the charger all weekend and do not worry about it. There is plenty of juice to run a TT motor for a week or so straight between recharging.
DC motors don't necessarily mean that its power source is a battery, in fact most run off of a DC power source. Why all of this discussion about batteries and none about the advantages or disadvantages?
Again, the advantages/disadvantages boil down to the execution of the design in regulating/maintaining speed.
Bob P.
I have a Platine Verdier, which I used originally with a standard AC supply - very good it was then. About a year ago, I bought a Battery PSU (GT Audio in the UK - www.gtaudio.com) supplying DC power to the motor, and this transformed the Platine - much quieter, less surface noise, greater dynamic range - one of my best ever upgrades. If all DC power supplies are similar, then go for it.