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The LG ICR18650HE2 are interesting. I found this on them from Congrevape which has a couple of links to data from LG. The LG technical page lists them as Li[NiMnCo]O2(H-NMC). So, they're hybrids, not ICR like I first thought. Max continuous discharge is stated as 20A there.
However on the Congrevape page it says 35A peak output. I take that to mean burst, maybe . I don't know where they get the 'Tested to 50A without failure' statement. From 4.5.2 in this document they are basically shorting the battery at 0.001 ohms and it does not burn or explode. I like that
The rate performance curves are I think phenomenal for mAh at high discharge rates. They also tested at 35A, so the battery obviously can put that out continuous and it didn't seem stressed enough to drive down the mAh. At all! I am not a battery curves junky, so if you are familiar with them please have a look and let me know if my thoughts on this are correct.
I suspect the Efest are not IMR, but also hybrid. Still have not found any data on them anywhere.