Deedit, you can use a battery.....just make sure its charged well before you use it and remove the charger during any testing.....as it may throw of the results or damage the TD45....
A power supply works just as good and is a lot easier to take to the track with you if you want to take your dyno. If yer only dyno testing stocks and 19t motors......a 30 amp will work fine......
TripleX-Jt, the new motors work great in all classes we have tried them in so far......the difference between the evo 0 and evo 30 is the brush hood. The EVO 0 is a regular laydown.....and the evo 30 using a 30 degree angled brush (its still a regular laydown)......we have limited testing of these, but for all purpose they seem very good also......the only downside is that takes a WHILE to break in the brushes and they really need to be precut in with something like a fussybrush to prevent excessive comm wear.