Just sold my TK75, have 2 extension tubes but not the carriers. (other projects) So I can’t check a carrier to see how it tests out with no cells installed. I’m thinking, from when I modified one before, that while the negative carries through via the brass rods the positive would have to flow through installed cells. I could be remembering wrong, of course, but it sure seems that it had to be populated to flow current. Without cells in place, there would be no throughput at the positive end. Like I said though, I no longer have the carriers or the light so I can’t be sure. (Or DO I? Might not have shipped the TK75 yet, will check…)
I highly doubt we will be actually using TK75 carriers due to cost. I think they will be more along the lines of the Thorfire S1 carriers but with a second contact ring added around the outside edge. The current would then pass down through the metal connecting pins. The PCB in each carrier would be setup to connect in parallel. So if not all cells were installed or even no cells power would pass right through them as if nothing was wrong.
The other nice thing about doing it this way is that all 8 cells would not HAVE to match, while a good idea the most important thing would be for all the cells in each carrier to match. Since the carriers are setup in parallel it would be just like RC batteries when they are used in parallel.
I actually never planned on actually using the TK75 carrier, it was just the only example I could come up with. The carriers have been planned to be custom made all along unless the manufacture just happened to have something that would work.
I put a single R140 resistor on the bank of the TN42’s driver, it’s now doing 710Kcd on LG MJ1’s and 722.5Kcd on 30Q’s. With some 2500 lumens, it could probably stand a wee bit more…
Will update list later
Yes I contacted them via theri website and got a standard “thank you for showing interest in our software blabla please contact us at X@X.com” reply
So I send an email to the address asking the same, no reply yet
Aren’t the carriers going to be in-series in the tube though?
I am most likely too late or way off base to mention this, but what about a battery tube that can house 2 rows of 4 cells?
Line up 4 in series on one side in a battery slot, and if you want to run 8, line up 4 more down the other battery slot.
All of course housed within the battery tube still exactly how it looks from the outside, in the GT renderings.
Just because the carrier are physically stacked on top of each other doesn’t mean they are electrically connected in series
With the way I have it planned out each carrier will be it’s own 4S “battery” (which is what it technically is) and they will be electrically connected in parallel, giving you 4S2P. If you leave one empty, it will simply be 4s1p
4s li-ion, so, the driver will be in buck or boost config? or just a Fet direct drive one
if using 4s and xhp35, i prefer the DD driver, simple but high efficiency
Overall I'd say the quality is very good - no noticeable rings or horizontal marks in the finish as you can see in some reflectors, 2 minor marks/imperfections, big flat surface on the bottom. it's a lot like an over sized HD2010 reflector. The flat bottom on the underside is about 33.5 mm - too big for any stock MCPCB to clear the wire connections, but lots of room to add flat copper extensions outward, so might just do that with using a 20 mm MCPCB, which the recessed cutout in the shelf is made for.
This is actually a clever idea, the carriers could either be keyed so they only go in one way or you could have the 2 carriers each be 2 cells long and half circles. Load one set of 4 batteries in or load 2 sets. It wouldn’t offset the balance as well, but it would simplify the installation of the cells as you wouldn’t have to keep track of which side of the carrier you insert them into.
Either way you would still need to have custom battery holders made…. in which case you should just make them parallel anyway.
Being able to put all 4 at the back is why people want a double long tube in the first place, for balance.
Possibly wouldn’t even need carriers. Bore the battery tube with 2x ~26.5mm wide openings side-by-side. Have a rotating tailcap (Olight x7 style) so the springs stay in the correct place.
Not sure if I’m right but running 4 would be 4s1p,
running 8 you’d have 4s2p???
