I guess I am the worst at this kind of testing because after a couple of hours of watching a flashlight I get distracted with something else.
Last night I turned my S2 driven at 1400 ma on medium and let it run. It was a little warm, so I decided to cool it off and put it in the freezer, with the intention of removing it in ten minutes or so. Well yeah, an hour or two later, I pulled it out and the light was on low, and blinking. The battery was at 3.25 volts. I let it warm a bit and the voltage was 3.28 volts, and the light would light on high. I put it back on medium, and 30-60 minutes later, I fell asleep. When I awoke this morning, the light was OFF. The battery voltage was 3.0. It still has three modes.
I put the battery into my MSC20 and it will not go into high.
OK... I put the battery back into the S2 on high and waited.
It ran for a while, then dropped to low and started blinking. Battery voltage is at 2.95 volts