Four-Sevens 16650 Li-Ion for Legacy Quarks (From Prometheus / Darksucks.com)

Stress_Test

Flashlight Enthusiast
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Feb 18, 2008
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I had been looking for 17670 cells to use in my original Quark lights that have the 2x123a body (both on the Turbo-X and standard models).

Instead, I discovered (on CPF) that there's a popular 16650 size, which now has more capacity than the old 17670s did! (~2200 vs. 1600 mAh)

I ordered two 4-Sevens branded cells from Prometheus Lights (darksucks.com) since they still have some 4-7s stuff. I got them in today and checked them out.

Nice packing! Cardboard box with foam cutouts to fit the cells, and this box was inside a larger shipping box. A+

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These cells are almost identical size to the AW brand 17670 shown here.

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I test-fitted these cells in a few lights:

Streamlight PolyTac -- no fit (no surprise, even cr123a primaries barely have any clearance to slide in)

Surefire G2, 6P, C2 (all P60 lamp versions) -- fits easily; slides in, falls right out

Fenix TK30 (old MC-E model) -- fits easily, as expected since it was made for 18650 originally, but won't fit the bloated new cells

Quark 2x123 body and Turbo-X -- barely fits; the cells drag a little going in, takes some turning and pushing to find the right "clocking" sweet spot. To remove the cells, have to turn the light upside down and give it a few firm shakes. The old AW 17670 cells are the same way. Let's face it, 4-7s just made that 2x123 body tube too dang small. :( They DO work, though, and should be a nice capacity increase vs the old AW cells.

So for now, I finally have new rechargeable cells to use in my Quark Turbo-X again, AND the old TK30 will no longer be a fancy paperweight!

I think I'll try some of the Orbtronic 16650s next. I've had a couple of their 18650 3500 mAh cells for a while and I've been happy with those for my Solarforce lights.
 
Sometimes rebranded cells have two outer wraps. One from the manufacturer and one from the reseller. If that's the case here just remove the outer wrap and the cell should fit your Quark.
If you damage the inner wrap, just get some shrink wrap and re-cover ii.
You can find 18650 shrink wrap cut to size on Amazon which will still fit 16650s.
P
 

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