The There Are No Stupid Questions Thread

I havn’t found oil in the can of compressed air, but definitely use a dual air drying system on my air compressors when shooting lacquer

I’m going on a long bicycle tour and would like to take 2 18650 lights (Lumintop Prince and Nitecore HC30).
Is there a small portable charging device that I could use on my trip that I could charge and carry with me to charge up my batteries along the way?

Yes, there are several options for that. But there is one portable device clearly the most efficient, cheap and compact, it is called ‘spare batteries’ :slight_smile:

Depending on how long the trip is, there comes a point where it becomes more efficient to bring a charger rather than a mountain of batteries. :-)

Thanks for all tips guys, managed to get it quite clean.

I have filed down the reflector even more and now the bottom is really thin, just as the gasket, i think this is all i can get out of it, very happy.

To clean it i have rinsed it using running tap water and blew it out using my new dust blower which recently arrived. After that i used 70% rubbing alcohol which i still had lying around (kids…) and used cotton wool which worked great.
Blew it out once again and it ended up really well!

XPL-HI V3-1A with BLF X6 driver

I have got the Xtar Ant MC1 Plus, which is really small and useful, i just use my phone’s charger

https://www.nkon.nl/charger/xtar-ant-mc1-plus-li-ion-mini-battery-charger.html

Maybe this?

magchgr by F/8, on Flickr

solarchgr by F/8, on Flickr

I have a big 32650 waiting to be used on the flashlight. Anyone recommend me a light ? Thanks.

2D Maglite and a dummy cell?

There are no stupid questions...

but there are dummy answers.

My question is this:

Given that God is infinite, that the universe is also infinite and the speed of light is 299 792 458 m/s…
Would anyone like a toasted teacake?

Toasted teacake? Hmm… got any crumpets??

Ask me a question that is wholly unbready and not even slightly curranty.

I had a biophysics professor in college who was very fond of saying that any time infinity comes up in physics, it was natures way of telling you that you screwed up the math somewhere.

Does anyone have some good rule of thumbs on how many amps various LED’s typically pull in 1x18650 and 1x14500 lights?

Basically debating when to use higher amperage batteries (VTC6/30Q , Windyfire 14500) vs. higher capacity (NCR18650GA, panasonic 14500)

xp-g2
xm-l
xp-l
xp-l hi
xhp 35 hi
xhp 50

etc…

why li-ion cell is 3.7V, but not 3v or any other voltage?

Some people do have infinite egos though.

Difficult to answer because there’s more variables than you mention here (spring bypasses?, length/thickness of led wires?, low or high drain batteries?, old produce XP-G2 or new produce XP-G2?)

Personally, for every build again I look at the led test data, the battery test data, and at the components that I will be using, and then I do the calculation.

Why are there almost no protected flat top 18650's?

I've only been able to find one, at an online vape site with no real assurance of it being genuine.

To be “protected”, you need the board on one end, usually the negative, and the sense-strip running to the positive end. To secure that strip at the positive end, you need a cap on top of the nekkid positive terminal, and usually that’s with a button-top cap.

Most are double-wrapped, with the sense-strip running between the 2 wraps, others like the panny-B just have Kapton tape covering the strip, which is then visible.

Most probably figure that if you’re sticking a cap on it already, you might as well make it a button-top so it’ll look like conventional cells and fit in holders, etc., without the need for nipples, springs, etc.