26800 Lithium-ion battery

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FlashPilot
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Any luck with other lights/mods using these cells?

texas shooter
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FlashPilot wrote:
Any luck with other lights/mods using these cells?

Not yet the machinist I use is slow this time of year. He’s got the tubes from an L6 to cut an extended tube for the Convoy M-3 and the Astrolux MF01.

FlashPilot
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TS, those sound like worthy mods to accommodate this cell and worth your effort. So far, KawiBoy’s FT03 mod seem the most simple to accomplish and certainly worth while for its other variants. Aloft Hobbies is out of stock on the QB26800 at the moment but is expected to receive more cells in 2-4 weeks.

texas shooter
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I cut the bottom off the left side of an Xtar X2 charger so a 26800 now barely fits. Recharged two batteries both drained from a HaikeLite HK4S which has a 2.72 volt cut off. First battery is a Shockli 5500 mah and the second was the QB26800. Shockli charged 5703 mah, QB26800 charged 7124 mah. Both batteries are on their 3rd or 4th recharge.

FlashPilot
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Thats a great idea for your X2 charger. Those are some nice comparative charging results. Aloft Hobbies is still out of stock on the QB26800. I emailed them again a few days ago to see if and when they plan on re-stalking.

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KawiBoy1428 wrote:
Got the 26800 to fit a FT03 with De-lensed 90.2.. copper contact on driver, bored out copper rings and driver retainer, to space out battery tube, flat laying (when totally compressed) alloy gold plated tail cap spring… 4.21v 22.7amps 5200lumen off the T/A maukka lumen tube. Purchased 4 of the QB26800’s… thinking about maybe making a couple custom tubes for other lights I have…it is a really good performing battery so far…

Can you post pictures of what you did to the head and where did you find the spring you used for the tail. I want to try it!

Tom E
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They are in stock now!! https://alofthobbies.com/qb-26800-6800mah-37v.html

Qty 2 shipped isn't bad.

FlashPilot
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Thanks Tom E. These came back in stock twice before and I missed out. Did you receive their in-stock email notification?

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KawiBoy1428 wrote:
Got the 26800 to fit a FT03 with De-lensed 90.2.. copper contact on driver, bored out copper rings and driver retainer, to space out battery tube, flat laying (when totally compressed) alloy gold plated tail cap spring… 4.21v 22.7amps 5200lumen off the T/A maukka lumen tube. Purchased 4 of the QB26800’s… thinking about maybe making a couple custom tubes for other lights I have…it is a really good performing battery so far…
Awesome, great info ! I may try this with mine in the future.

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Tom E
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FlashPilot wrote:
Thanks Tom E. These came back in stock twice before and I missed out. Did you receive their in-stock email notification?

Yep! Surprised I did. Seems like usually, these don't work, or the item never comes back in to stock (on other retailers).

Just ordered a pair. Already have 1 piece from Ali. That FT03 mod looks interesting - gotta check that out. Impressive amps pulled as well.

FlashPilot
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Tom E wrote:

FlashPilot wrote:
Thanks Tom E. These came back in stock twice before and I missed out. Did you receive their in-stock email notification?

Yep! Surprised I did. Seems like usually, these don’t work, or the item never comes back in to stock (on other retailers).

I guess you got lucky. I never received the notification and its not in my spam folder. Oh well… thanks again for posting. I plan to mod my FT03 fleet but not sure I want to hack into my new copper 90.2 version. Also have a 2 × 26650 light with an addition extension tube that could use some additional mAh. Fun stuff!

I just checked my email and already received a shipping notice. Thumbs Up

Tom E
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Cool! My ship notice came bout an hour ago smile

Holy Cow! 14000 posts!! I gotta get-a-life surprised

alpg88
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is the positive terminal high enough to use them in series? they look exactly what i need for my hotwire lights

texas shooter
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alpg88 wrote:
is the positive terminal high enough to use them in series? they look exactly what i need for my hotwire lights

Very close but Yes they can stack.
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KB - I'm also interested in more details on the FT03 mod. Looks like you saved a lot of space on the driver side.

I'm thinking, but haven't check measurements, you did this:

  • reamed out the center of the driver retaining ring to make it thinner so the battery can fit through it (probably can dremel it down)
  • tossed the original plastic piece around the driver spring
  • removed the driver spring and replaced with a small flat copper slug (or something like this?)
  • replaced the tail spring with one that will compress completely flat (dunno where to find one like that, but I could rig of something equivalent I think

Not sure if the first 3 would get the batt as low as you show there in the tube, but it would help. If you used a lathe or something like that to mod the tube or head, I'm screwed.

Update: Ohh, ok. You added bored out copper rings, so you used those for extra spacers, and I see you filled in the gap on the outside with a black o-ring. Think that's the trick...

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Why is it that so many 18650 lights have stoopit-long springs but all the 26650 lights I have are contortionist-tight?

I got an old River Rock 2×C light that I tried stuffing in a regular 26650 but it was too tight a fit. Might try “boring” it out a bit with a sander or something, as it’d be worth it to stuff one of these in there and take up the slack later.

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AlexGT
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If you need to increase the inside diameter of the battery tube use one of these with a drill.

https://www.amazon.com/Powerbuilt-648631-Disc-Brake-Cylinder/dp/B0015UWU...

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Kewl, tnx!

Thought I’d be grinding away forever with one of those cylindrical sanders.

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Tom E
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For the FT03, making those copper rings (or ring) as a spacer, probably fitted under the brass driver retaining ring, is probably not an option with the tools/supplies/skills I have. I could though perhaps use copper wire formed in a loop. As long as the spacer is conductive and relatively even thickness, and doesn't interfere with inserting the battery, should work.

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Took some measurements on my SP70.
Even with the springs really squished, and the threads not fully engaged, noway are a pair of 800s going to fit.
Looks like the tube needs another 23-25mm or so for a comfy fit.
All the Best,
Jeff

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If that new 26650 6400 mah Vapcell pans this mod doesn’t gain much.

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Yep, I ordered a pair of the K64's from Ali. They went up in price from $20 for 2, to $25 for 2, plus tax, plus shipping.

For me in NY, that would be about $29 for a pair. The 26800's cost me $17.35 for a pair from Aloft - big difference.

Plus I got a Reese's Peanut Butter Cup in the box laughing. Ok, a little weird but it tasted good...

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Texas shooter asked about a 26800 extension tube for Astrolux in Fins sales thread. Fin said he submitted the request to Astrolux, but I doubt it will materialize without a lot of requests from others. Artiet59 mentioned, “All astrolux models / tubes you mention do work together, but ft03 unfortunately does not. Ive tried..” That’s too bad since I need several for my fleet of FT03 lights. Maybe they will make 2 versions. It shouldn’t be too much effort for them to produce them.

For those who need a copper contact disk, they can be found at esty.com in all sizes.

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Tom E wrote:

Yep, I ordered a pair of the K64’s from Ali. They went up in price from $20 for 2, to $25 for 2, plus tax, plus shipping.


For me in NY, that would be about $29 for a pair. The 26800’s cost me $17.35 for a pair from Aloft – big difference.


Plus I got a Reese’s Peanut Butter Cup in the box laughing. Ok, a little weird but it tasted good…

I’ll be surprised if those will compete with the QB26800 above 20A sustained, but I’ve been surprised before. Im looking forward to your impressions and hope for the best.

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true - the QB26800 is rated at 30A continuous, the K64 is rated at 15A continuous.

texas shooter
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FlashPilot wrote:
Tom E wrote:

Yep, I ordered a pair of the K64’s from Ali. They went up in price from $20 for 2, to $25 for 2, plus tax, plus shipping.


For me in NY, that would be about $29 for a pair. The 26800’s cost me $17.35 for a pair from Aloft – big difference.


Plus I got a Reese’s Peanut Butter Cup in the box laughing. Ok, a little weird but it tasted good…

I’ll be surprised if those will compete with the QB26800 above 20A sustained, but I’ve been surprised before. I’m looking forward to your impressions and hope for the best.

I’m seeing those two points also. I paid $59.27 for 8 Mooch tested QB26800’s, half the amount for untested K64’s. But they need a custom tube. Most of the listed lights operate under 15 amps. Except 7 LED MF01 mini, and FT02S that’ll need all the amps a battery can push. Future lights like Astrolux EA01S will definitely want the highest. I’m looking for both runtime and output. It’s QB26800 for me, I’ll gladly pay extra for the extra tube.

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Hummm,
I clearly need a lathe. The tooling. Someone to show me how to use it. And a place to put it.
Other than that, I’m ready…..

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Tom E wrote:

For the FT03, making those copper rings (or ring) as a spacer, probably fitted under the brass driver retaining ring, is probably not an option with the tools/supplies/skills I have. I could though perhaps use copper wire formed in a loop. As long as the spacer is conductive and relatively even thickness, and doesn’t interfere with inserting the battery, should work.


Done it on the drill press… made an arbor out of thread all nuts and a socket with a diameter close to what I needed.. use a rotary file, tootsie roll, or sanding drum to open up the I.D. of the copper ring with about ,003 stock press fit to the O.D. of the socket arbor, press the copper rings on using the next size up socket which so happened to also fit the arbor nut…you can use any material to space the front of the tube out… the battery tube threads are bare…………………………………………………………………………………………… Wink Here are more pics…of the mod… EDIT: Instead of using 2 rings to extend the bat tube at the front..(head)…I’m using one in the front and one in the cap.. yes you do have to open up the I.D. of the driver retainer ring also..

KB1428 “Live Life WOT

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215Wh/kg and 600Wh/L is pretty low, especially since that’s only at 1.36A discharge.
And the more current you draw, those numbers drop to significantly less.
A high capacity 18650 or 21700 can do much better specific energy and energy density at higher currents.

texas shooter
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Enderman wrote:
215Wh/kg and 600Wh/L is pretty low, especially since that’s only at 1.36A discharge. And the more current you draw, those numbers drop to significantly less. A high capacity 18650 or 21700 can do much better specific energy and energy density at higher currents.

Those of us going with single cell lights this cell tops in capacity with practical output. I also have lights in 18650, 21700 and several other sizes. I think you may have missed the flavor of this thread and that is to take something different and run with it. In this case the 26650 lights and how to incorporate a 15mm longer and better battery.

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