26800 Lithium-ion battery

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!

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

Qty 2 shipped isn't bad.

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

Awesome, great info ! I may try this with mine in the future.

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.

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 x 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. :+1:

Cool! My ship notice came bout an hour ago

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

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.

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...

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.

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/B0015UWUQG/ref=asc_df_B0015UWUQG/?tag=hyprod-20&linkCode=df0&hvadid=330419580385&hvpos=&hvnetw=g&hvrand=1794983497195518505&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9027658&hvtargid=pla-642254789926&psc=1

Kewl, tnx!

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

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.

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

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

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 . Ok, a little weird but it tasted good...

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.

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.

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