Does anyone know if it's safe to use this flashlight with a lithium powered primary (Energizer Ultimate) which delivers 1.7V ? The included manual only refers to NiMH and Alkaline.
You willl be fine with a lithium primary. The spec for the Ti is the same - 0.9v-1.5v, but I've given lots of those away as gifts, and always include a lithium primary cell for non-flashaholics. No problems reported in the past year.
@dc38 - are you sure you aren't using a 10440 rechargeable cell?
Despite any complaint/minors on this line of product (Ti, Ti2, Tis), in my opinion they're the best AAA flashlight.
I just got a new Tis few days ago in a mail, I gave it to my neighbour and he's happy!