A very interesting flashlight. I have posted pictures of it before, but they are scattered.
This is someone's findings about the flashlight , Translated from Chinese:
L2 use LD29 of lithium-compatible single and double circuit, current manufacturers data for 2.6A-1.5A-0.1A - 5 file-SOS flashing the circuit with low voltage alarm.
Single lithium-state: 4.19V Sanyo battery 2600MAH battery terminal voltage 2.4A highlighted
Life time is 65 minutes in the life course of gradual decline in current, non-constant.
Di-lithium state: 4.17V Battery 2600MAH SANYO side highlighted at 1.2A
Life time is 120 minutes. Before the 110 minutes a constant current. 10 minutes after the current gradually decreased.
[Endurance test time is all down to start the brightness of the light 50 percent of the deadline.]
[Life is not to begin to test the lights go out time to calculate, based on light levels down to the beginning of the 1 / 2 the time it takes to be calculated.]
I never noticed this thread before and then Hank came along promoting the XinTD brand from intl-outdoor and that was the first I ever heard of it. Good find, Hikelite.