26650 Batteries

no kidding right - i saw those pics and started drooling

that n-light only says 18650's everywhere I look..where to get the 26650 version?

Sorry, pounder, we went off topic (as usual at BLF Laughing). If you re-read the OP, I ordered the ST60 (18650), it was out of stock and CNQG is sending me a JM07 (26650). The ST60 can run on 1 or 2 18650's only.

Simple test. Get yourself a current shunt rated to around 50A off eBay - like this one

http://www.ebay.co.uk/itm/50A-75mV-Current-Shunt-AMP-Meter-Gauge-/150592189350?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item230ffe73a6#ht_1091wt_1180

Read the instructions and attach it to your multimeter as suggested.

Short the cell across it and read off the current. If it can't do 10A on a dead short (Should be nearer 45) it is crap. You might be able to read a value before the protection circuit (if any) cuts in.

Whatever you do, don't run this test for any longer than it takes to read the meter.

Really, really don't do this for more than a second.

I disclaim all responsibility for melted shunts/meters/hands/houses.

thanks for clearing that up lol

We didn't go off-topic, we came back on-topic! See thread title!

-Garry

N.Shock provided a good link below that indicates at least one brand of "INR" branded cells are LiNiCoMn02 chemistry, like the Sony 26650VT cells. They're capable of VERY high discharge rate and are far safer than standard LiCo cells, but can still be volatile if there were a short or a puncture.

Personally, I completely avoid any cell not being explicitly represented as one of the safe chemistry formulas.

That's horrible advice. Even if someone was willing to ruin a SAFE battery with a dead short, which would, permanently increase the cell's internal resistance, what if it was not a safe chem or protected cell? LiCo cells DO vent flames and DO explode, and either/both can happen very quickly. Big cells like 26650's pack A LOT of power - pipe bomb power.

That shunt is meant for measuring voltage drop across it under load as a means to measure the current going across it, not to dead-short a battery, power supply, etc.

To answer question #2 on the first post the only ones are from manafont, they are only 4000 mAh + not the claimed 5000 mAh, but they should be close to the king kongs with mAh.

I have brought one of these just to test out and see if they can be used in series with TR-J12 with out modification unlike the king kongs.

TrustFire - Protected TF 26650 3.7V 5000mAh Rechargeable Li-ion Battery

#5 yes the TR-J12 will dim not sure about the others

Updated first post to include links to 26650 batteries. I'll keep track if anyone posts new ones.

Dave

Good work rides.

One thing i have not tested the trustfire 5000 mAh yet myself but reports on the net they are between 4200 and 4500 mAh like the king kongs, but i belive no one has been able to test both batteries with a discharge higher then 1 amp discharge due to basic hobby chargers and for the king kongs they have gone off data sheets.

Once my sample gets here most likely in 2 weeks i will discharge the trustfire 26650 and king kongs at 3 amps and then run a 7 amp discharge test with data logging and post up the graphs if hjk does not beat me to it, i think the trustfire protected 26650 is the safest option as its the only one protected and at 3 to 3.5 amp discharge the king kongs and protected trustfire 26650's should be close.

Im intrested to see if the protection pcb can give atlest 3.5 amps as thats all it needs to give and that is about the most your well driven xml will draw on one cell, since the 2400 / 3000 mAh 18650 trustfire flames can give 3 amps no problem i think they should be fine and early reports seams good.

There was a 1 amp test done here post #7

https://budgetlightforum.com/t/-/6606

SOLID bit of work Dave!! Heres 2 more for your consideration:

http://www.4sevens.com/product_info.php?cPath=53_57&products_id=2585

Of all these cells, which ones have the lowest internal resistance, and highest "C"?

thanks!!

Not sure about "all", but from those 2 you posted (4Sevens 26650 and Powerizer 26650), 2nd one is capable of higher currents and has lower internal resistance.

Updated first post. Thanks benckie and kramer!

If the cells can't do this for the ten or so milliseconds it will require to do the test the bin is the best place for them.

I think I have it narrowed down to these 3:

http://www.lighthound.com/Lighthound-LiMnNiCo-26650-3500mAh-Rechargeable-Lithium-Battery_p_3478.html

Which one of these is the best in terms of internal resistance and current delivery capabilities? That last one claims its capable of an 18A (!!!) draw... is that for real or a typo? They measured 3794 mah capacity at 18A rate (!!) in the test below.

And heres the discharge curve:

I am not worried about capacity since they are all around ~3500 AH, and that will vary greatly with current draw anyways, and I don't need cell protection. For this light I am using an XML in direct drive, and it draws 4~5A from a single cell.

Are there any others I should consider? I would like to avoid Ebay and the Asian exporters, simply because domestic sellers like Lighthound and Batteryspace are competitively priced, honest and ship fast. Is this a wise decision?... or should I expand my search?

I am leaning towards that one with the 18A capability... unless someone can convince me otherwise.

thanks in advance!!

It’s a IMR, even a 18650 one can do 20A easily:

So nope, not a typo.

kramer:

I am not any kind of electronics expert like Don or Shadowww or many of the other experts on this forum. I am pretty anal about researching stuff to get an understanding before I use it. So I'm expressing my opinion here, peppered with a little research knowledge. Lithium-Manganese (IMR) and some of the newer chemistries have several advantages over conventional Li-ion (Lithium-Cobalt). They are safer in that they don't vent with flames and don't contain the same noxious and dangerous chemicals, and they allow high current draw and are more tolerant of lower discharge than Li-Co. Because of this, you don't typically see protected versions. Check out AW's line of IMR and you will see all are unprotected.

So if it were me, I would do as you noted: Buy from one of the trusted U.S. sellers and buy IMR. That's what I intend to do in the future until the re-sellers and the battery makers start getting their shit together and provide us with more information. Or until we get some testing results from the most excellent BLF testers!

Ok. There appears to be a couple of different King Kongs being sold by IO. Mine are ICR 26650 XSL. The ones on there website now are INR. Simply, are the ones I have safe or not? They are being used in a JM05. Google has not been much help and the more you read here the more confusing it gets.

For anyone that is interested they were supplied with a small magnet aproximately 1mm x 5mm to go between the batterys as the negative and positive would not make contact. I have read that some people have a concern that if the magnet slipped it could short out on the outer tube. I dont believe that this would cause a problem as the magnet is to small in diameter to be in contact with the positive part and the battery and the outer tube at the same time.