Hi,
Would be helpful if those who believe or do not believe in C ratings share track test results.
Example, I've done lap times on a car where the only thing I've changed is the battery, back to back so track condition is the same.
Car = 1/10 on-road touring
Motor = Johnson 540
Test time = Time in seconds to complete 3 laps, done several times to get a consistent result
Orion Platinum 4800/25C (255grams) - 68 seconds
Peak Power 5000/50C (300grams) - 65 seconds
Conclusion: For me, the cheap China made Peak Power was 45grms heavier, yet 1 second a lap faster in a Silvercan TC class. 5% improvement in laptime is big.
hth.