Hi BLFers,
Since Wurkkos will prepare 2-3 models related to AA/14500 size. In order to better understand all people’s preferences and needs, we hope to conduct a poll investigation related to that!
Voted. Additionally, Anduril 2 would be great 
Any AA size, make sure to have no charging port.
You know some idiot will stick in an alkaleak, NiMH, etc., and try to charge it.
Bad Things will happen.
A 14500 cell with built-in charging circuit would work, though, despite lower capacity (14430+board), but the convenience might be nice. The user can also use a regular 14500 with external charger if he has them.
Also, you can’t guarantee that using a “smart” internal charger would work, eg, by sensing a too-low voltage like for an alkaleak/NiMH, because someone might stick in a LFP cell (3.2V) and it would still try charging it up to 4.2V. Boom!
I tried to make it idiot-proof, but they made better idiots.
Option C: if voltage < 2.2V then charging = 0;
But if lights dedicated for idiots so no charging no lithium only AA.
imo, this is a very good idea
that way the light does not need built in charging, the buyer does not need a charger, and they can use regular AA if they want to, with no risk of someone trying to charge a non rechargeable AA
I agree a 14500-size with built-in usb-c would be best. This has been the approach taken by Acebeam with the Pokelit and it seems to work well.
For Wurkkos it would also be a backwards-compatible solution for upgrading the successful ts10 line to include charging via the same type of battery.
I generally do not like lights with built in charging and removable cells. If the target buyer is a liht muggle then make it idiot proof. if aiming it at us then most everybody into lights have a charger.
I voted. 14500 and AA, no USB charging. Everyone so far has made good arguments for their position.
But the reduced capacity of the 14500 cell with USB, versus some perceived convenience factor doesn’t do it for me. The 14500 is anemic as it is. I have also read instance where the charging circuit dies in these things, rendering the cell useless. Users can use NiMh with dual fuel lights. If they do, they already have a charger.
14500 only with USB, well it brings the liability of reduced water resistance, increased complexity and cost, additional failure modes (not good for the consumer nor Wurkkos) plus it removes the option of other very commonly used cells as backup.
I voted for solution A but would also ask Wurkkos to offer a 14500 cell with USB-C charging port as bundle. Take the cell Manker and Acebeam are using and label it with Wurkkos.
If it was an option in addition to dual fuel, I agree it would be a good one to have. For occasional use, maybe travelling or the like. it could come in handy. Always nice to have options.
I voted dual fuel as well. It seems your largest competition is yourself, as the TS10 is such a brilliant light. The only things it does not have are AA capability and fully regulated output (a symptom of Anduril). For market coverage, a light with those things would give people a choice of two of your lights.
Dual fuel for me. I already have my TS10 as Li-Ion only, and my FC13 (albeit 18650-size) as USB-ported, so a light capable of taking both 14500 and AAs would best complete my collection (and IMHO Wurkkos current portifolio).
YEESSSS!! Anduril is the best, I love it lol
Got it! It seems most people hope that. We will definitely follow the poll result ; )
That’s good idea. I will report it to Wurkkos engineers immediately.
The rational analysis! Follows users to get a better experience is always what we are pursuing.
Definitely dual fuel - even if I don’t intend to actually use AA in the light I want to be ABLE to.
I do not want a charging port in the light itself, but don’t care about a 14500 with a charging port one way or another
Option A: 14500 + AA compatibility without USB built-in.
I recommend including a protected 14500 cell with a USB-C charging built into the cell.
The flashlight should have low voltage protection for 14500 3.7V Li-ion and AA 1.2V NiMH cells.
Please support:
Unprotected flat top 14500 3.7V L-ion cells.
Unprotected button top 14500 3.7V Li-ion cells.
Protected button top 14500 3.7V Li-ion cells (same length as an eneloop AA 1.2V NiMH).
AA 1.5V Alkaline
AA 1.2V NiMH
AA 1.8V Lithium primary (if the torch can be mechanically locked out).
Good man Terry! 
And please keep up the great work Wurkkos is doing with Anduril and keep using the AT1616 with the flashing pads in the same layout as your current lights (TS10, FC13, TS25, etc)
Important to make sure the button-top H10 fits, it is one of the more popular 14500 cells at 52 or 53mm overall length. Some TS10s work with it and some don’t.