Multi-Meter advice...

If you look at an internet TV show,, I think it is Ham Nation but it might be Amateurlogic.tv.. Recent (last quarter of last year) George Thomas built and demonstarted a small one-cell LED light I can not recall the name of the kit but it was designed for use in 3rd world countries and takes AA cells that are, shall we say, past their prime.

This is NOT the one George reviewed but sure looks like a basic copy of it..

http://www.instructables.com/id/GEMS-DEAD-BATTERY-FLASH-LIGHT/