18700 + 3xAAA = 21700?

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raccoon city
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18700 + 3xAAA = 21700?

If a flashlight will take a protected 18650 (a 18700) and will also take 3xAAA, then will it necessarily take a 21700?

snakebite
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i tried several of mine and 21700 fit.

MRsDNF
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Length could be an issue.

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

djozz said "it came with chinese lettering that is chinese to me".

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Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

Henk4U2
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I know for sure that somebody will say: but there are programs for it on the net. Aren’t there? Yes there are!
But I am an oldfashioned techie who used to calculate things without an electronic device.
So what size should be the diameter D of a hole where you can put in three (equal sized) smaller cylinders (batteries).

Using a ruler and a pair of compasses I come to: D = d * (1+2/√3) ……or…… D = d * 2.1547

where d is the diameter of the smaller circle/cylinder (the AAA battery measures 10.5mm or 0.41in)

So I’m pretty sure it will fit. (after removing the sleeve Silly )

I always think long and hard before I say something really stupid.

snakebite
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fit fine in my “green ring” zoomie and ultrafire g700 type zoomie.
its tight lengthwise but fits.

thijsco19
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Answer for ‘A’ is 10.

18700 + (3x(A^3)) = 21700

21700 – 18700 = 3000
3000 / 3 = 1000
Cube root of 1000 is 10.
Solved Grad

Yep I don’t know what I’m talking about Big Smile

snakebite
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ROFLOL!
btw i tried in a hausbell tulip/x700 zoomie and while it works its a bit snug the last thread or so.
i didnt want to crush/dent the cell so i stopped.
o ring is well engaged so no problem not bottoming the tailcap.