Worth the extra cost.
I've been using the Ultimate Lithiums for a very long time and I've found them to be dependable in extreme conditions,- hot weather, winter conditions, etc. I particularly like their long shelf life.
My heaviest use is for outdoor activities, hiking, backpacking, long canoe trips, etc. Engaging in these lengthly excursions are not times when I want to have my batteries crapping out while using my GPS or headlamp,- you get the idea.
Obviously, all batteries eventually die, but the lithiums put up one hell of a fight.
I also have to say that the price on these was / is pretty good. I'll pay the extra over the alkaline any day.
Verified purchase: Yes | Condition: New