Continuing my flashlight addiction....
I have field tested the olight s15 and I am very happy with it. I'm using a 14500 li-ion battery as my primary power source with eneloops as a backup. The big difference is on the high setting you can see a huge difference in cycling from medium to high with the 14500 and not too big a difference with the eneloop.
Also after selling some random junk on ebay, I scraped up some dough for that eagletac d25a I've been wanting. After making an offer on an auction it was accepted for $45 shipped which made me happy.
The d25a came in today. Tried it with a 14500 and an eneloop. Big difference with the 14500 on all settings. Very nice light and powerful for an AA light.
Comparing the two- s15 has the tube extender to go 2xAA and the magnetic tail cap. d25a has more light settings (beacon, SOS) and the body is much thinner. I would much rather have the d25a in my pocket than the thicker s15. I'm having trouble getting the d25a into moonlight mode, much easier to switch functions on the s15.
Price: s15 -$38.50 shipped d25a =$45.00 shipped (this was an offer made, cheapest I could find it was $52 on ebay)
Bottom line- I would take the s15 over the d25a for ease of use and the magnetic tail cap and price.
I am still carrying the olight i3s EOS as my EDC in my pocket unless I am doing something specific where I know I will meed more light. Then I would pocket carry the d25a. S15 is carried my my man purse (5.11 man purse
) as a backup with spare batteries in tow.