Calculating ''C'' rating

[BrianG]

lol, sorry.

From the initial formula, it looked like you were taking Ah, multiplying by 1000, then dividing my mAh. Which would always be 1.

I don't really get why you are trying to calculate the C rating. For one thing, the manufacturer doesn't state the voltage that will be present at the advertised C rating. The only benefit I can see to this test is the verify that the C rating is approximately accurate, but again, since you don't know what the manufacturer considers an acceptable voltage at that C value, verification will be kinda pointless. Or are you just checking to be sure that the pack will deliver the current you need in your setup without tripping the LVC?

Regardless, testing is difficult. So, you get 98A, what does that tell you? Yeah, you can then assume the C rating of a 5000mAh battery is 19.6C. But again, what battery voltage is the pack holding at that value? Unless you set an arbitrary minimum acceptable voltage, you aren't really getting what you want IMO.

And for another thing, 98A is far beyond the 40A and 150w rating of your device. Even a 1s pack (one cell) running at 98A is pushing the device almost 2.5 times its rating, and the power developed at 98A (around 360w for a single cell at 3.7v) is 2.4 times the device rating.

Sorry, I'm not trying to be a "bubble buster".