Apparently, revive's voltages were open circuit voltages and, for the sleeve-on test, they were measured at the sleeve output.
At 2 hours and 7 minutes, the sleeve open circuit output was 1.32V. This means the bettery under the sleeve was practically dead since the sleeve could no longer regulate properly under open circuit condition.
Right before this measurement point, one would expect the flashlight showed sudden dim to no light, though revive did not mention it.