Hi and batteries do not fit in a SRK copy question and more,

LED Flashlights – General Info 18650 Flashlights
1

What a terrific forum, just found it and the level of information is just amazing!

So I bought this what I now learned Sky Ray copy with 11 led’s.
But the 18650 2800mh 5A Samsung I did buy here at home do not fit in the casing, yes I should have read more before bought.

Now after reading a while I see that the batteries are put in parallel and that I could run it on two.
But now looking some more I guess that on full beam it will take maybe 110w? and that comes out to 29A, would 2x19650 20A 3000mh rated do and provide me with some 10min light or would the contact surface be to low and cause problems?
And using my 5A samsung will not do anyway if we really are talking 29A, but would work just fine in a Convoy S2+ that from what I can see do it’s worst with a 2.8A drain.
But maybe those Sky Ray’s do not pull that type of current at all and I got it all wrong?

Also,
Another noob question while at it,
AMC7135*4
AMC7135*6
AMC7135*8

Is that just how much current that a like Convoy S2+ (thinking of a “investment”) will feed the led with, that is a lumen/drain thing only?

Thanks for any reply’s.

-lyse99

Edit in,
Changed subject to a better one,

2

Welcome to BLF!

Most SRKs do not pull a lot from cells and work fine with even 1 cell, can you link us up with yours?
And I am a bit confused, what is the problem with fitting since you seem to be able to place 2?

yes more 7138/5 chips more amps to the LED
for a S2 size lights most will say 4-6 are plenty since more power means higher temps and a light like that does not have the best cooling capacity. Also you get more runtimes and the more 7138 chips the hotter the led, less efficient, so more o the mAh of your battery is wasted on heat instead of light.

3

Those 6 or 12 LED lights use only a fraction of the LED potential

Often they have fake Cree emitters from Laticebright

In reality they end up at 2000-3000 Lumens at most, drawing 20-30W

4

@The Miller,
Thanks for the Welcome and explanations.

I will post pictures that do explain the problem better when I done them and a link to the flashlight it self later when I get up.

Also will take your suggestion in consideration when I do purchase the S2+.

@Lexel,
Thanks for the answer, if it’s like no more than 30w then 2x 5A will do so it gets some use.

I was looking for my 20 amps multi but just did find my old max 10 amp one, that one I do not want to try just in case, but I will measure the current and post that as well later, might be of some interest for some one else as well.

-lyse99

5

Each AMC7135 gives 350ma.

7135x4 = 1400ma
7135x6 = 2100ma
7135x8 = 2800ma

personally I always go for x8, because you can just use a lower mode if desired
but still have max output when you want it.

6

@Angler,
Thanks for the info!

So here comes now the link to my particular lamp,
ebay link,

And here are the pictures of my problem and the flash-light,

The battery used is in the pictures, also went to the shop for a swap to another brand but that did come out even worse,

Trying to load the four cells, this with the small stripe on all cells facing towards centre,

So here we see that even with two cells like this they would not slide down,

My AA “duct tape enhanced” dummy to be able to see that it did actually work,

“Duct tape enhanced”,

Unfortunately the bottom do not come off, because that would have made it easier to see if I could “dremel” off some material to get the cells to fit.
I probably will have a go at that anyway as I suspect that the narrow part seams to be on the “waist” of the cell chamber.

I will probably first measures the current on high and if it’s less than 10A I will not bother to “dremel” it.

And from this I have at learned to make some better research before next purchase.

-lyse99

_Footnote to Admin :slight_smile:
I really had to think real hard about the fresh registration captcha and I was at one point thinking it was a broken function, and now afterwards if this actually was the mensa site :wink: I think maybe some actually bites the dust on that one. (tested it today on a couple of more here and they did bite the dust)

Also,
Some 120-150 pixels on the avtar would make for some more “artistic ones”, just a thought from a fresh noob here that really appreciating this forum.
Not that good on paint programs, but this was what I was aiming for, not so visible._
Aiming for,

7

Yup looks like a srk clone
Strange that they don’t fit
What a beautiful reflector, thought it looks like LaticeBright LEDs (and for this price hardly unexpected)
I use most SRK type lights with two cells

8

I have a seen a light just like that. The bores are not large enough to even accept a button top conversion cell because of the extra thickness of the rewrap needed. A flat top, not re-wrapped, cell, with a slight rise to the + ends did work but made me nervous.

9

You could try 600 sandpaper to get the shrink tube facing the body and to other cells a bit thinner

Another solution would be unwrap the transparent and the blue shrinktube on the cell and use a single shrink tube, you may add some kapton tape to insulate the wire if its not double sided with it

10

Or just check if the runtimes are acceptable with two cells :wink:
I find them adequate :slight_smile:

11

Looks like I got my self even a ”bad copy” :slight_smile:
See the last part of the post.

That is what I am going to do, now when I know what the somewhat real current/effect is.

Thanks for the suggestion, that was my plan but with the measure result’s it’s not worth the work to get 2 additional cells in there.

I have not tried the runtime as of yet, but with the effect we actually are talking about here I will settle for just two cells in this one.

Part 2,
So I have now measured the current in a ”sort of” scientific way, (yes I really know my way around electronics, even that the workbench shoot would suggest otherwise)

So I will post some pictures here and I do not claim them to be the absolute truth but can be maybe be seen as a interesting read/view.

The “horrific” set-up on the workbench, props. can be spotted to enhance safety,
(do really not do it like this at home!!!)

High beam,
(pretty low so RI should not be much of a issue IMO, Lexel was spot on with his “at most” experience)

Mid beam,

Low beam,

My SRK copy,

Vs,
my old version X21 trusty

The SRK copy on left and X21 on the right, tried to zoom to a “similar illumination look”,
(not that fair of a comparison maybe, but those “28.000LM” are not that fair either :laughing:

Conclusion and wisdom drawn,

Take the time and do a read-up if possible, especially if you going for the cheaper no brand stuff.
I still think this SRK copy will serve a purpose and it is actually so well built that I do wonder if some of the parts not coming from some official manufacturer and limitations are set within the electronics.
With now roughly only 7w, decent quality and even 2 cells give not a bad runtime and it will not get to warm, so it will actually have it’s place at times.

-lyse99

12

Yeah most SRKs are pretty bad (hence the Q8 startup :wink: ) and I went for 3 or 4 emitter ones because then swapping LEDs is affordable comparing it with 9 or your 11

13

@ OP:
So, what if you take out that bottom PCB with the springs?
Isn’t there any way to gain some millimetres there?

14

Thanks for the sugestion but it’s not the length, it’s the width of the cells.
Check pictures above.

-lyse99