Group Buy for the GearBest Ultrafire F13 - Closed?

^ Good question. Maybe a lathe guy or machinist knows the answer.

I think you just reduce the cut depth for the facing operation. A lot.

So for this light we’d

Remove the LED
Remove the driver
Get an “anvil” with a good enough flat face that would fit up inside where the driver came out, and rest against the plane surface.

And put it in a press with another “anvil” held at exactly the same orientation down through the front
And squeeze.

That’d work if the metal flows enough under pressure (if it’s close enough to even thickness all across, just ‘dimpled’)
But if both surfaces are a bit concave — it won’t.

I think I’m just going to goop on more goop….

No need for it to flow. If both sides of the shelf are concave, we use a convex anvil on the bottom and a concave anvil on the top (LED) side. Right?

it’s way beyond anything I can manage.

Does the driver in this light have a low-voltage limit (so it’s ok to use unprotected batteries, without risk of draining them too far)?

Asked Karen from Gearbest for a new coupon for F13.
New coupon is GBF13 and you can buy it again for $9.99$, unlimited items.

nice.thanks

Yup yup

Very nice!

These F13 clones fit the high capacity, low resistance KK 26700 cells too!

Has anyone tried this light with the 3AAA adapter?
How is the current and output?

light output was not bad but compared to an 18650 or 26650 it gets crushed. I have not tried it with aaa enloops though.

Werner, do you mean 3AA? I think most 26650's can hold 4AAA.

EDIT: I'm not think straight. 3AA is wider than 26650. 4AAA should fit though.

Thanks downlinx, did you just a quick test or have you used a whole set of batteries in it?

On one of the customer pictures there is a Adapter shown:

Not sure if it is a 3 or 4xAAA but any of the guys who have bought one could easyly tell, I cancelled my order so I never got one…
I would be interested in a tailcap reading with Alkalines and with lithium primaries and the overall impression how it works for a usual guy.

That’s my picture. It’s 3xAAA, I never tried it with that config, it is a 26650 flashlight and I will not run anything else in it. The flashlight is good enough with great potential. Maybe I will mod it soon. I can’t measure tailcap reading because I don’t have a good enough multimeter at the moment.

I’m really having a hard time judging size from the pic’s, I actually didn’t even know it was 26650 till just now, can someone provide bezel opening (as well as head opening, probably a few mm different) measurements please?

What exactly do you mean by bezel opening and head opening? I got 3 of these things...

Sorry, I posted in wrong F13 thread!

Still only $11 for this light. I like mine.

jack we heard you the first time. Once is enough.