Looking for E1L Cree runtime graph ? where do i find ?

I would like to see one also. I did do a runtime test and got about 5 solid hours of output until the light started to flicker.

Does anyone elses E1L Cree flicker when their batteries get low? Its really no big deal but it would be nice to get solid light until the batteries are drained without the flickering. My L1 cree puts out solid dimimishing light until the batteries are drained.
 
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