Battery #1.0 High Amp Test. Massive voltage drop under load on this 4 year old battery?

I had to do this test because I could not believe the test results form the Sun Fun Kits team. I have never seen such a high voltage drop in my own batteries as they have shown in their video (this on here:    • "Grade A (vendor claims)" vs Grade B ...  ).
So, what better could I do than double the load on my cells in comparison to their test. 500W per cell!
What voltage drop will we get and what internal resistance can we measure during such a high amp test?

Internat Resistance Tester:
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All results are in this spreadsheet here. I will continue adding data when doing more testing in the next video. It will be interesting.
https://docs.google.com/spreadsheets/...

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