3 18650 cells in a triangle - tube size?

Does anyone know how to work out what diameter tube i would need if i wanted to stack 3 18650 cells in a toblerone shape and then pit them inside the tube with virtually no clerance as i cant stand rattles!!

( ( distance from center of equilateral triangle [side length = cell diameter] to one of the points ) + ( cell radius ) ) * 2

Approximately.

~38.5mm snug.

Thanks, er maths was never my strong point.

Would this be possible inside a Mag?

mcmc said:

Would this be possible inside a Mag?

Click to expand...

Pretty sure not.

Easy for you to figure:

Tape your three batteries together and stand on a table top on a sheet of paper.

Put a straight edge on one side, draw your line on either side of "pack."
Repeat for each side of the pack.
Fill in the lines to create your triangle.

The tube passes throught the corners of your triangle.

mcmc said:

Would this be possible inside a Mag?

Click to expand...

No.

And 38.5mm probably won't accommodate the fatter 18650's (AW protected, LG, etc)

( sec(30) + 1 ) * 18.5mm = 39.86mm

I wouldn't go smaller than 40mm.

38.5mm is one AW, one Emoli and one Sony IMR.

Hope this helps.

18.2mm is to account that ALL 18650 will work.
Most are 18.0mm but a few (protected) are 18.2mm

MagD will not work.
Only the following custom hosts.
- modamag's Colossus
- HA22 Mammoth
- FM fat body. I know V1 fit not sure about the V2.

BTW: Mag are 33mm if my memory serves me correctly.

Do you wish to buy, sell or trade something? No? Then why did you post this thread in B/S/T?

I measured the ID of my older Mag the other night. The caliper would not reach the main tube where the batteries reside but the threads themselves are around 35.7mm and there is a small lip so I think the tube is around 34mm. The other end I measured around 37mm. I think the tube has an OD of around 40mm but I'm too lazy to go measure it right now. Keep in mind that this is an older Mag that has the larger diameter body and not the more slender current one.

For 3 x 18mm cells :

18 x 2.1547005384 = 38.785mm

I'd go with 40mm and make it snug with heatshrink wrap..

modamag said:

Hope this helps.

18.2mm is to account that ALL 18650 will work.
Most are 18.0mm but a few (protected) are 18.2mm

MagD will not work.
Only the following custom hosts.
- modamag's Colossus
- HA22 Mammoth
- FM fat body. I know V1 fit not sure about the V2.

Click to expand...

If someone would build a body for the three (3) 18650's above and allow it to use the common KT-4/M3/M6 Surefire "M" heads and a new clicker tailcap I'd bet they would sell quite well... Wish I was a machinist/CNC guy.

modamag said:

18.2mm is to account that ALL 18650 will work.
Most are 18.0mm but a few (protected) are 18.2mm

Click to expand...

All of my black protected AWs are a bit more than 18.2mm wide (18.2mm~18.40mm) and protected Tenergy 18650 batteries seems to be even more wider.

Jesseri said:

All of my black protected AWs are a bit more than 18.2mm wide (18.2mm~18.40mm) and protected Tenergy 18650 batteries seems to be even more wider.

Click to expand...

Thanks for the info including the tolerances. This is good to know for all those folks who post asking about boring their SF's and wonder about remaing wall thickness. Thx.

Slightly off topic, but will a tri-bored Mag D hold three 17670 cells?

Ty_Bower said:

Slightly off topic, but will a tri-bored Mag D hold three 17670 cells?

Click to expand...

Yes

modamag said:

Hope this helps.

18.2mm is to account that ALL 18650 will work.
Most are 18.0mm but a few (protected) are 18.2mm

Click to expand...

I would use 18.5 or a bit more to be on the safe side with the diameter of 18650. AW once posted a data sheet where it said max. 18.5 mm.