I'd want more than one data point, though. I'd test with batteries at an under-fire potential of about 2.7-2.8V to ensure continued safe operation at lower charge levels. I'd consider any batteries used for these tests as potentially expendable (and certainly the hot springs).
I'd do this with a shorted 510 adapter rather than an RM2 to prevent damaging any atty insulation. Even at this, the insulation of the 510 in the mod potentially may be compromised.
Safety measures: face shield over glasses, heavy gloves, non-synthetic clothing with lab apron. If you think you might gasp if a battery vents, consider a respirator. Do this under a hood or outside. Wrap loops of tape around the battery top and bottom to be able to extract it with gloves on if necessary. Hope for the best, be prepared for the worst.