I didn't look at the C rating.
However, I still believe it will run fine in a KWA. The C rating is just the battery's safe discharge capability. The motor will determine the current draw.
For example, given a motor that can pull 30A and three batteries:
Battery A is rated at 11.1v 1500 maH 15C
Battery B is rated at 11.1v 1500 maH 30C
Battery C is rated at 11.1v 1500 maH 40C
This means that Battery A can supply up to 22.5A, Battery B can supply up to 45A, and Battery C can supply up to 60A. If you use Battery A, your motor will be performing under its potential (22.5A < 30A) and I suppose because of this, less wear will take place. The caveat here is that trying to draw 30A from a battery that can only supply 22.5A can cause it to overheat and fail prematurely, or worse. Overheating may also be possible because lower C rated batteries have higher internal resistance.
If you use Battery B, your motor can now perform at its full potential of 30A with 15A of spare room. This can arguably cause more wear now that the motor is running faster, but only because it was starving for power in the first place. Even then, the motor is not going to require 30A the whole time unless what it requires to run is 30A minimum, which I doubt AEG motors need.
Furthermore, if you use Battery C, the wear will be the same as using Battery B since only 30A will still be pulled by the motor, you just now have 30A of spare discharge in the battery. An analogy that can be used is a car's alternator, just because the alternator is rated at 120 amps does not mean it is outputting this, it depends on what the car's needs are and what pull is required of it.
So my conclusion is that the voltage of a battery determines how fast a motor runs more than its C rating, 9.6v will always be 9.6v no matter what battery it is. Therefore, that Madbull 9.6v LFP at 40C should run fine in a KWA. If fact, I would argue that it would cause less wear than an 11.v LiPo rated at 15C.
It's better to have a high C rating, especially if you decide to upgrade to high power springs and motors later on which require a high draw to run. Too low of a C rating can be dangerous, as detailed above. Use a properly rated fuse if a high C rating still worries you.
This is how I understand it after doing much reading and information gathering and from past car audio and RC knowledge. Please correct me if I am wrong.
Edited by whiterabbit05, 22 July 2010 - 02:57 PM.