First discharge graph

First discharge graph
First recorded discharge, first test ot test fixture

Well the fixture seems to work. I think that we have a test system.

Some uncertainty as to if I was fully charged at the start, but we have a respectable 18AH
The temperature rose immediately and this was at only 68A, so I want some active cooling, based on just this test.
Next I will charge back up, and re-run the test but this time with an infinite heat sink right against the cells instead of the insulation.
The violet cell started at a lower voltage, but soon after the discharge started it was higher, and it remained higher for the rest of the discharge.
Wonder what that means?