I did this runtime graph over a year ago, which shows a nice flat runtime. Olight says the runtime for the Desert Tan I3E is 1hr, 10min with NiMH. This graph confirms that. Note that this graph was for the silver 120 lumens version. The desert tan is the 90 lumens version, which would have a slightly longer runtime.
Use an Energizer Ultimate Lithium, and you will get about 1.5 times the runtime.
1.5 the runtime.
Nice. Thanks Terry! I was already planning to use Energizer Ultimate Lithium in mine. Your testing confirms that it will be a good choice.
The charts don’t really tell the whole story, though. The Energizer Ultimate Lithium cells are very expensive, and one time use. Eneloop Pro are NiMH rechargeable. So, the runtime for the Eneloop Pro would be that same length of time, over and over again, for as many times as it will take a full charge. That means, it really beats the Energizer Ultimate Lithium on complete runtime by a few hundred hours! 
I know you know this, and most of us BLF members know this. But some people don’t, or they might just miss it when looking at your data. So I thought it needed to be clarified.
Understood. I use Energizer Lithiums in my car lights, where the light might be used sporadically over several years. I know they are unlikely to leak, shelf life in excess of 10 years, and aren't as bothered by extreme heat/cold.
It absolutely needs a low mode
a simple high / low would work nicely.
it's a sweet color ,a heck of a good price and ..yeah it needs a low
Just bagged one in the UK, thanks!
In the German shop also free light plus 40% on a bunch of lights
H2R Nova
Olight I3E EOS
free shipping
54€
“finger in front of lens low” on mine… 
I used that “low mode” method also Streamer. 
. It works like a
charm….
^^^^
Anyone do a long term test with a 10440?
Yes, well over a year ago. As I recall, it ran for 5 minutes + (much brighter), then it just turned off by itself. Then it was permanently dead.
Thanks Terry. Guess I won’t using one in mine. Bummer cause I like 10440 lights.
I wonder if it would be safe with a LiFePO4 cell, since the voltage is lower. :innocent:
Got mine today , it’s tiny , smaller than the jet beam jetu.
The tint is nice & white.
The included battery is shite.
Now I’m getting spammed a few times a day by olight , time to hit the unsubscribe button me thinks.
Finally . . .
And you can never have enough AAA alkalines from companies you've never heard of.
I have 10 of these in copper New in box and I absolutely love it..
Thank You from the UK.
Yeah, it’s the color of milk chocolate.
But I can’t complain.
I like it , it’s super bright for its size , it’s blinding to look at (I don’t recommend it) ,the twist action is super smooth & easily operates with one hand ,the specs say 45 minutes runtime on alcaleek but what’s impressive to me is you get 70 minutes with an eneloop pro.
. … Do you buy your Milk Chocolate at the 5 year out of date store?? 