5761 Without AW Cs

[MCFLYFYTER]

I would like to build a 2 cell 5761. All the info I find is on C cells. I want a 2D, and I am planning on getting a soft start driver. Any recommendations on the best driver and cells to use. Thanks

 

[cernobila]

One of my first 5761 lights.......you start with 2xD M*glite, alloy reflector, glass lens, AW soft start/three level switch, 2x Kai protected D cells......cut down the tail spring as needed and you are done......

 

[MCFLYFYTER]

Are these the cells? If so, are these the only option or the best option?

http://www.kaidomain.com/ProductDetails.aspx?ProductId=2751

 

[MCFLYFYTER]

They recommend this charger.

http://www.kaidomain.com/ProductDetails.aspx?ProductId=2735

is there a better charger I should get?

 

[^^Nova^^]

Eneloops in a 6AA-2D holder will also work, although the runtime will be something like 20min max.

Batteryspace has some 26650 LiMN cells, but these will likely blow the bulb even with a sort start. They would be great with a regulated driver though.

AW is thinking about making some LiCO (Li-Ion protected) cells in the same size too. Hopefully he does...

Cheers,
Nova

 

[cernobila]

They recommend this charger.

http://www.kaidomain.com/ProductDetails.aspx?ProductId=2735

is there a better charger I should get?

Yes for the cells and yes for the charger.......

.....I use a Pila IBC with two D size trays customized to charge mine, but the above is the easiest solution.

 

[bigchelis]

Are these the cells? If so, are these the only option or the best option?

http://www.kaidomain.com/ProductDetails.aspx?ProductId=2751

I purchased 4 of those black cells and at 2.8~3.3A at the tail in a Mag build the voltage of the cells was not acceptable. I later put IMR C cells in the build and the voltage was good again. The voltage under load was tested by MrGman while testing my direct drive P7 Mag's and as you have already guessed it did affect the OTF lumens. Shortly after these tests I sold the cells and the charger they recommend actually fell apart. Yes, the charger was put together with some type of grammer school glue:green: and after 3 or so cycles the charger was practically in pieces and I couldn't use it anymore.:shakehead

The IMR 26650 cells, which are nearly the same height as a D li-on. In fact, Krammer5150 uses 2 of them in a 2D Mag and they fill the lenght perfectly.

bigC

 

[MCFLYFYTER]

That is what I was looking for. THANKS

 

[kramer5150]

The IMR 26650 cells, which are nearly the same height as a D li-on. In fact, Krammer5150 uses 2 of them in a 2D Mag and they fill the lenght perfectly.

bigC

these are the cells bigC is referring too.
http://www.candlepowerforums.com/vb/showthread.php?t=234724

http://www.batteryspace.com/limnnirechargeable26650cell37v4000mah10arated148wh.aspx

PVC coupler made from 3/4 junction tubes.

 

[Mjolnir]

The batteryspace 26650s are about the same length as an unprotected 18650 (about 65 mm, go figure...). They do fit well in a 2D without any tailcap modification. All you need is a very low profile spring.
However, they are not really IMR cells, they are LiMnNi cells. The max continuous discharge is stated as 10A, while the AW IMR C cells are rated for 20A, and have less capacity. This means that the AW cells are rated for a discharge of about 8C, while the 26650s are for only 2.5 C. Because of this, they probably sag a little more, and therefore might be less likely to flash a bulb than the IMRs. Of course, a 10amp max discharge is more than enough for most practical incan hotwires. I can run a 3854H bulb in a stock (except for the spring) maglite with 2 of these cells, and without flashing the bulb; I think this is not as easy with IMR cells.

Kramer, where did you get PVC coupling without the ribs inside (where the two pipes would meet)? All of the 3/4 inch coupling that I have been able to find at local stores has this ridge on the inside, which obviously blocks the battery from going all the way through the tube.

 

[kramer5150]

Kramer, where did you get PVC coupling without the ribs inside (where the two pipes would meet)? All of the 3/4 inch coupling that I have been able to find at local stores has this ridge on the inside, which obviously blocks the battery from going all the way through the tube.

I just cut the rib out with a sharp knife and file it smooth.

 

[bigchelis]

The batteryspace 26650s are about the same length as an unprotected 18650 (about 65 mm, go figure...). They do fit well in a 2D without any tailcap modification. All you need is a very low profile spring.
However, they are not really IMR cells, they are LiMnNi cells. The max continuous discharge is stated as 10A, while the AW IMR C cells are rated for 20A, and have less capacity. This means that the AW cells are rated for a discharge of about 8C, while the 26650s are for only 2.5 C. Because of this, they probably sag a little more, and therefore might be less likely to flash a bulb than the IMRs. Of course, a 10amp max discharge is more than enough for most practical incan hotwires. I can run a 3854H bulb in a stock (except for the spring) maglite with 2 of these cells, and without flashing the bulb; I think this is not as easy with IMR cells.

Kramer, where did you get PVC coupling without the ribs inside (where the two pipes would meet)? All of the 3/4 inch coupling that I have been able to find at local stores has this ridge on the inside, which obviously blocks the battery from going all the way through the tube.

Nailbender has been testing the IMR C cells at 9A with a SST 90 and he told me the OTF lumens are more with the 26650 cells. I know it is off the subject, but is there a review that compares these two cells against each other somewhere?

Thanks,
bigC

 

[bk737]

I use the same pvc couplings in a 2D ROP. I used my dremel to quickly and easily remove the ridge in the center of the couplings so the cells can slide through. Easy to do and Cheap, a 2D can be set up for $1.50!

 

[Benson]

However, they are not really IMR cells, they are LiMnNi cells.

Yeah, the cathode is Mn based -- which makes them IMR cells.

 

[kramer5150]

Further info on these cells....

They are larger diameter than standard C cells, so they will not drop into any current production C-mag without boring the ID. Furthermore, they are far too long for a 2C and too short for a 3C. So the only way to get them to fit a mag perfectly without adapters or extenders is to take a 3C, bore its ID and then cut it to the right length.

Yes they are the same length as an 18650, and 2x18650 fits snugly in a 2C without the tailcap spring.. however the 26650 is too fat to fit in a mag C tailcap.

 

[Mjolnir]

Yeah, the cathode is Mn based -- which makes them IMR cells.

What I am trying to say is that they are not the same chemistry as the cells that are advertised simply as "IMR," like the AW cells. Those a LiMn, while these are LiMnNi, which is not exactly the same.
The energy density for these 26650s seems to be slightly higher than the AW IMR 26650s.

 

[cernobila]

Wow.....now I am confused with all the choices.......

I have two set-ups, one is the 5761 with two Kai protected D cells and the other is the 1909 with three Kai protected D cells. They are both very bright and work without any problems....but....

If the Kai cells are not any good, what other cells would give max output for the longest run time with the above bulbs in D size mags? I use the Pila IBC charger with wired-up D size holders and would like to continue to use this set-up. A version of the 26650's sounds like an option.....but which ones?

btw, I don't care about the chemistry.

 

[bigchelis]

Wow.....now I am confused with all the choices.......

I have two set-ups, one is the 5761 with two Kai protected D cells and the other is the 1909 with three Kai protected D cells. They are both very bright and work without any problems....but....

If the Kai cells are not any good, what other cells would give max output for the longest run time with the above bulbs in D size mags? I use the Pila IBC charger with wired-up D size holders and would like to continue to use this set-up. A version of the 26650's sounds like an option.....but which ones?

btw, I don't care about the chemistry.

I have that very same FM1909. My combo is a 2D Mag running 3 IMR 26500 AW cells. The current at the tail is 5.60A, yes it is that high even with 3 IMR Cells.

Check the current with your FM1909 and 3 KD black cells. What do you get?

bigC

 

[cernobila]

I have that very same FM1909. My combo is a 2D Mag running 3 IMR 26500 AW cells. The current at the tail is 5.60A, yes it is that high even with 3 IMR Cells.

Check the current with your FM1909 and 3 KD black cells. What do you get?

bigC

Well I finally done this check and this is what I found;

cells were charged to 4.19 V each for a total of 12.57 V,
at the tailcap I got a reading of 11.68 V, a drop of only 0.89 V,
after some fiddling around and some help from my wife, (I needed three hands) I got a reading of 4.74A on high setting (have the AW soft start/three level switch)

Actually performs better than I thought, I think I will continue to use these Kai protected cells, no real reason to change.

 

[bigchelis]

Well I finally done this check and this is what I found;

cells were charged to 4.19 V each for a total of 12.57 V,
at the tailcap I got a reading of 11.68 V, a drop of only 0.89 V,
after some fiddling around and some help from my wife, (I needed three hands) I got a reading of 4.74A on high setting (have the AW soft start/three level switch)

Actually performs better than I thought, I think I will continue to use these Kai protected cells, no real reason to change.

As I suspected. With my IMR C cells I get nearly a whole 1A more at the tail. I wonder if the extra current I get is noticeably brighter:thinking: