Oshpark Projects

Sssh, we could gave kept him at it for hours.

Bad news is, I had the diode reversed. Good news?

I have 4 levels, .02, .29, 1.47 and 3.02 on an Efest IMR10440 sitting rested at 4.12V. :slight_smile:

Oh, and I can barely see at the moment…

Awesome relfow job…very smooth!

Is that the current pull (.02, .29, 1.47 and 3.02) thru that Tiny10?

Is 3A safe for a 10440? Whoah…

Awesome. Well done. Care to do a failure analysis working your way up the current ladder?

You want me to feed it bigger bullets? Until it dies? Aw man that’s harsh! It’s such a pretty little thang!

The Efest IMR10440 delivers 3A routinely. I use em in my MBI HF’s that are direct drive to XM-L2’s. I’ve got almost a dozen of em. :slight_smile: (cells, I mean, only 3 HF’s, of which I EDC 2 and the TP which also uses an IMR10440)

I, uh, well, I’ve got this 14500 high discharge cell that can probably fry the lil dude. I’ve got an AW IMR14500. Also an Int Outdoors protected 14500, and then I’ve got bigger fodder…

Ok, Ok, I’ll go run the 4.20V Efest IMR10440 through it, see what it says at full charge. BRB…

Well I gotta get offa my duff and start modding…I have 4 of those Mini C8’s now and a handful of other projects to do…dang

The 3.02A made me wonder..

I had only done output measurements on my LZZ-06 build sofar, I just did a current measurement with a full Efest 10440 battery held against the head: 3.45A on high

I switched to 12 g solid wires on the meter and hit 4A with a keepower 18500

19.1K should be OK…

I took it up to 4.23A with an AW IMR14500, is that enough? .02, .32, 2.00, 4.23A And with subsequent runs, letting each mode sit in use for several seconds at least, it did about the same. Started getting a little lower as the cell pulled down but yeah. It’s up there. The IMR14500 was at rest at 4.08V.

Should I try the bad ass 14500? Or even bigger cells? I probably have something that will fry it, with Sony C4, C5, Efest 35A, Samsung 20R and 25R on hand.

A protected 18500 AW cell gave me .02, .26, 1.64, and 3.58A

The protected Intl Outdoor 14500 did .02, .29, 1.56, and 3.15A

Slightly off-topic: those Efest 10440 cells can do not stand endless torture, after 5 minutes at high on my little LZZ-06 BLFtiny12-FET build initially it looked like only the shrink-wrap had suffered from the heat, now a few days later brownish gooey came out pulverising the paper disc on top, it still works though...

I ran an Efest IMR18650V2 through it for .02, .34, 1.63, and 4.15A
So then I ran my badass 14500 charged to 4.19V through it and it did .02, .35, 2.16, and 4.52A.
Wanting to see what else she could handle, I broke out the Samsung 25R charged to 4.17V. It did .02, .38, 2.34, and 5.13A. Seems to me it’s pretty capable of pretty much any cell I have. :slight_smile:

How hard is it likely to be pushed in the lights in which it will be used? I think we’re already past that but you know you want to find the ceiling first. Push it ’til it fails or set that board aside and make another to kill. Chips are cheap, much cheaper than an equivalent number of 7135’s.

High current or high heat?

Scott, I’m betting the only thing that could kill that 10440 is a combination of all things evil…high current draining it to very low levels while heating it to boiling point. 5 minutes under an FET driver is brutal for that small cell. But, djozz DID say it still works! :slight_smile:

I’ve ordered some 15’s for testing. I have a few of the 2502’s left for this.

I do not know for sure, my first reflex is: high heat, the light got so hot that I burnt my fingers twisting it off. but it had been running at 2+ amps for most of the five minutes by then.

It’s important to know the failure points of our little light bombs so as not to give away a tragedy.

It is indeed important to know what these lights are capable of, but it’s difficult to go by my findings if I manage to fry it cause I do all kinds of other things wrong. :wink: Nature of the beast and all that.

But you know, if it can put out over 5A then I’m going to be pretty happy with it just under 3A. Might even have to change some things in the firmware to limit it to say 80% or something, just so it doesn’t hit those really high numbers.