IMO, any lipo manufacturer that claims more than 50C is full of it unless they can produce proof on video using accurate test equipment that their lipo puts out the amps it claims. I have tried three 2s lipo's from different manufacturers. They vary from 50C to 70C, from 5A to 6.6A. Quality of cells, one stands apart from the others. Performance wise, they are very close to equal. I wouldn't fall for the high C rate hype.