I think this would be the correct spot for this question.
What rechargable 123 battereis will work well in the SureFire Saint Minimus?
What rechargable 123 battereis will work well in the SureFire Saint Minimus?
I think the LiFePO4 3.2v batteries should be alright.
I haven't tried it, but I expect you'd only get about 30 minutes of runtime on high.