just received a feedback from Olight, neither i1R EOS battery nor the circuit board has protection for over-discharge, which confirms my earlier testing as the light will continue to run in sub-lumen mode for a couple of hours, no matter you start it in High or Low. The lowest I have drain it so far after 10+ discharge testing is down to 2.43V, don't do this to your unit as it's unhealthy for the battery, especially since the battery wasn't designed for user-replaceable.