Nothing.
That is definitely the biggest negative with going smaller.
The SP10 Pro driver would help some and make it easier to carry a spare eneloop (or L91 when I really care about weight - backpacking).
FB
I have a Zebra light AA. Itās great for reading and getting around the house at night. I would buy a Wurkkos warm AA/14500 L shape, at least 2. Iām sure Wurkkos would make a great one. I have 9 Wurkkos lights already and recommend them all the time - please do it!
This is a good starting point. I like the triple optic+auxiliary LEDs idea. Maybe do a triple optic for flood, and the TIR single LED for a spot/throw? Those are the most versatile headlamps I own. You could do the high cri neutral white for the triple optic and a cooler tint for the single LED. Please give it a fully regulated driver. At least 1500 Lumen for the optic and 1000 lumen for the single LED.
If you did the inline LED design, that limits beam distance and usefulness somewhat, but would still be a good concept.
Iām always interested in AA headlamps. maybe a mid-LED instead of the 90 degree style that are so popular? Something to compete with the TH20?
I think i would prefer a front design instead of a angle 90 degree
My dream is for a AA sized headlamp with regular tailcap, then, for longer runtime, a remote waterproof 2 or 3x18650 box, cable and AA sized adapter to thread into the headlamp.
Unfortunately nobody makes suitable battery carrier, else I would have done this already myself.
Edit to add: I was inspired by a post I saw on CPF then lost the link, just spent an hour googling and FOUND IT! Zebra light remote battery mod
Yes itās from 2015, I still want to do this myself, 7 years later 
Headlamp with remote batt. pack is necessary only at freezing temperatures and in extreme sports. Otherwise pure nonsense.
If it could maintain the same beam characteristics/profile of the TS10, I think that would be fine.
Above is your opinion, which youāre entitled to, but itās not a fact. Iām aware the product isnāt āmainstreamā but there are legitimate users who would want this, there are plenty of expensive caving lights that use remote battery packs, why not have something a bit more BLF?
Iām curious what other solutions are to achieve long runtimes at moderate output without having 2 cells strapped tyour headā¦?
Iāve worked underground where having 400 lumens for 8+ hours would have been brilliant. Or nights where 800 for 4-6hours would have been useful. I want a solution that doesnāt involve swapping cells.
Do you think anyone that works underground, or night shift, should stop halfway through a shift have to change batteries?
800 lumens for 4-6 hour on head??? 
If you need extreme power for long time why not just use handheld or portable light system! And yea, fact is that you can wear on your head whatever heck you want .Who cares. BTW i want headlamp made from cookie and powered by pixie dust
Wurkkos already has HD20 which runs on 21700 battery and HD15 which runs on 18650 battery. Both are using dual-lights and high cri. Why donāt Wurkkos add another right-angle lights to complete the line-up. I agree that Lattice Power CSP and Anduril 2 is a great combination, so hopefully to see another great lights from Wurkkos next year.
Iād buy one or two of these in a heartbeat, provided:
The UI was good and gave you an option to start in minimum red from any previous on state.
The moonlight was good- no worse than the HD15R.
I really want any 14500 light to also take AAs. This is the type of light Iād recommend a lot to normies, and those are the people who simply wonāt deal with 14500 only lights without onboard charging. (Actually, I have enough AA lights that donāt use 14500s that I donāt really have a desire for any 14500-only lights either.)
The TS10 is spectacular because of the LED choice and optics with the Andruil UI and compact size weight. Nothing else comes close at the price point.
It is an excellent EDC light because it does so much so easily in such a compact package. Making a headlamp version would just make it a more useful and spectacular EDC light.
Front vs angle would be a matter of how it goes in a pocket. I donāt think one should think of this as primarily a headlamp. It would be an EDC light that can be used as a headlamp.
It really gets down to the clip. That is the one shortcoming to the TS10 and could be easily fixed. With a really good clip and a right angle light, the functionality of it as an EDC goes up dramatically. When you can easily clip to anything from a shirt to a hat brim you really have a useful light! With a good clip, like the one on the EO2 II, you could have a headband that just has a little slot to clip to like the top closure on a pair of dress slacks. Simple light and a perfect headlamp mount for a headband. 18650 or 21700 lights are just too heavy to have this kind of flexibility. However, simply improving the clip and the direction the light comes out would make an already spectacular light just that much more spectacular.
1 Thank
I donāt get that, what would make it different than the TS10?
To me if itās not 90 degree itās not a head light.
A 90 degree TS10 would be ideal
The baton 3 maintains stable 300 lm for 1h30 from a 16340 with 550 mAh.
If I had one free wish from Wurkkos, it would be a good driver. Then talking about shapes.
+1 to this! Buck driver please
Yeah, 25$, H04 like, but with buck -boost and Anduril. And i will recommend it to every person ;))
I believe (but might be wrong) what Wurkkos is referring to in this comment is the design such as a Sofirn D25L, which technically is 90 degrees, just not oriented as a ātraditionalā top or end mounted right angle head.
And to kind of keep this on track, the idea proposed is to adopt the positive attributes of the TS10 as much as possible while incorporating them into a 14500 (or AA/14500/NIMH compatible) sized headlamp format.
Keep the input coming. Itās inspiring to see how ideas and interest develop, and terrific to see Wurkkosā interest and participation in the discussion.
This is what BLF is all about, IMHO.
Ah I get it - thatās fine - in the center looks better. I had the wrong idea about it. Maybe a bit more bulky but shorter.
Thanks!
As typical for blf threads, certain users so strongly insist on derailing a thread with borderline offtopic posts. Makes me wish we had stricter moderation, because these sorts of things tend to unnecessarily bloat a thread and invite conflict.
Personally I think Terryās idea of a āminiā D10 is quite attractive - sure it wonāt have the runtimes of a larger cell but I donāt think thatās really the point of what OP is asking. I am certainly interested, the idea sounds very novel.
Personally I donāt really care about red LED option that some mentioned. Triple emitter would be okay, but I also consider maybe cut the LEDs down from 3 to 1, and use a floody TIR, maybe 45 or 60 degree.
For me actually the main attraction of the ts10 isnāt the hotrod power but the size of it. Making a right angle version of ts10 will of course probably not be as svelte due to the form factor necessitating a ābumpā (especially if it goes down the D10/D25 form factor route). However the body could be made quite slim and sleek and thatās attractive to me. The ts10 absolutely disappears in my pack or pocket.