I made a mistake thinking that your graph is 3C. Simply did not check a number. It is not an intentional lie. My bad. By that, i also understated the watt hours that the cell would be wasting by a large degree. Do you notice that my story was consistent?
But.. do you think that my, what.. ~0.8v at 3C scales up to anywhere near the ~0.45v sag at 6.66C though?
Nope, it's probably under 0.15v on a new 20C cell that isn't 3 years old, don't you think? ohm's law and all that..
I can provide you a proper test, but this is a linear math problem from what i have experienced. So we can do simple multiplication here based on IR.
Hobbyking lipos are rated similarly, so let's do some theoretics on the multistar ( sorry, i don't have any in my possession, but i know a lot from icecube57 who tested them extensively ). My 20C turnigy registered at 1-2mOhm when new, i'd expect a 10C multistar of the same capacity to have 3-4mOhm. We'll make assumptions and calculations based on that.
The samsung 30Q is rated at 20mOhm, but that's a 3ah cell and not a 5ah - we've got a 40% difference in cell size, so if we scale the batteries to an equal AH, you're going to see about 12mOhm. This math works because IR scales downward proportionally to amp hours when the amp hours increase.
12mOhm and 3-4mOhm are clearly not the same. To get power density, we have to do a little math on the multistars to compare a 190whrs/kg to cell to a.. i'm guessing.. 230-250whrs/kg cell? and then that depends on whether you are thinking about power density in volume or weight. mmm.... yeah, given that these cells are not immensely different in size and weight, i'd say that you can't bridge the gap between a difference of 300% by doing that math. You can try though. Just make sure to show your math
You can call me a liar, but you did make a statement that was much more far off than my statement was, and probably didn't do any math to get there. So..
riba2233 said:
What the hell man, are you blind, or are you doing this on purpose?! I've posted a 20 A graph, which is 6.6 C, not 3C!
In reality, nobody is going to draw 20 A continuous from these cells, and they have better energy density than multistar, and similar power density.
And it's clear that they are better than 25R which, as you've said, have same power density as multistars at high C rates (although you've never showed 8 C discharge for multistars).
Please, don't run this conversation with lies, thanks.