These test were done by a friend of mine. If you have any questions, don't ask me, as I will not know. The equipment used here is pretty good and the testing is better than any others I have seen by anyone else. So this may answer some of your questions.
This is the reason I only use Samsung 25Rs. You can't seem to get VTC5s any more and the mAh on VTCs4s is only 2100, VTC3s even lower. The Samsungs can be hard for less money.
Battery Load Testing
This a start of load testing of some of the popular high current batteries. The batteries tested so far are all new 18650 and conditioned, with the exception of the Sony VTC5.
A series a tests will be performed on the batteries that are tailored toward the way it is used in vape gear.
The equipment used is a Maynuo Electronic load, connected to a PC. The PC controls the electronic load and logs the data from the tests performed. I built the battery rig, which incorporates small fans to pull heat from the battery if needed at high current drains. It is also used for after cooling to help bring the battery back to normal state and ready for charging.
This first test places the battery under a constant current load, but pulsed for 4 seconds on, and 5 seconds off. This cycle continues until the battery reaches a 2.5 volt cutoff.
Batteries tested:
Sony US18650VTC5
Samsung INR18650-25R 2500 mAh
LG - 18650HE2 2500 mAh
Efest 18650 (Purple 35A)
MXJO 18650 2500 mAh
SubOhmCell 35A 2800 mAh
Of note is the SubOhmCell 18650. This battery runs hot. Doing a 30 amp discharge test was very iffy. Also, this battery is very slow to recharge.
Since mech mods do not run at constant current, the next set of test will be with a constant resistance, but pulsed for X amount of cycles.
.4 Ohm Load Test.
This test loads the battery at .4 ohms for 4 seconds on, and 4 seconds off. It is run for about a total period of 13 minutes.
The actual data numbers are shown for the Samsung-25R battery. at this load, all batteries performed very close, all within .1 volts.
I didnt run the batteries down to its cutoff, as I dont think anyone would when actually vaping.
Here are the data numbers from the .3 ohm test. Although the chart makes some batteries look bad, I'd say there is no winner. They all perform very close. If another battery was used, or different charger used, that battery could easily be higher than all the rest.
So, given the test process that is closer to to way you vape, all of these higher current batteries will perform well. But at very low ohm builds, the more influence the mod and atty will have. A mod/atty with a .1 volt loss, can lose 20 watts of power.