http://fonarik4you.ru/published/publicdata/FONARI33WA/attachments/SC/products_pictures/Снимок%20экрана%202013-11-15%20в%2014.03.38_enl.png Good afternoon . You conducted the test at an average mode 70 lumens how long is shining a flashlight ?
I wasn’t able to run the 2xAA 70lm test before I accidentally broke the switch when disassembling the head for the review. 
However, my runtime test results on high were almost identical to manufacturer’s results, so the 7h for 70lm mode must be near the truth. Also selfbuilt’s review of standard S15 shows 6h36min with 2 x Alkaline AA -> 2 x NiMH AA should easily go over 7h.
Thanks for your reply. I understood.Two weeks ago I bought this flashlight. Therefore, issues such as the information is not completeWelcome to the Forum! 
The light only works with 2 AA which means 2 Li-Ion is impossible? 
Correct. - 8.4v will fry it.
Not a problem to use 3 x Eneloop though.
Thanks,
-Chuck