26650 or 26500??

[Switched]

Length notwithstanding, both are LiMn. The 26650 is rated at 4000mAh and max continuous discharge of 10A, whilst the 26500 is rated at 2300mAh and a max continuous discharge of 20A.

We know mAh rating are generally exaggerated, which one would you choose and why? The AW is the 26500 cell.

 

[kosliev]

the AW, because its just 1,5cm longer, the dicharge rate is more than enough on both anyways, and being both mAh's exagerated, the AW one might just be genuinely higher.

Plus i like the AW's red.

 

[asdaq]

Depends on what you want them for. If it is for the biggest possible single cell then the 26650. The 26500 C form factor is a real bonus though.

 

[Switched]

Something tells me the AW has more umph, then the 26650. Size is not a concern here. I am talking strictly performance.

 

[Java_Az]

AW for sure is going to be better, as far as i know they dont lie about there Mah. All the tests i have seen they are right on or a little bit lower but not low enough to ..... about really. Performance wise the higher amp rating is where my money is at.

 

[Switched]

Thanks Java that is where I am leaning. I am trying to find performance curves on both and came up empty.

 

[Java_Az]

IMR cells have not been around a long time so might be a bit hard to find info on them.

 

[buGG]

switched, CPF appears to be down at the moment, but there is a graph showing the performance of that MNKE cell. basically, it's doubtful whether it really is actually a LiMN or more accurately an unprotected LiCo. with a max. continuous discharge of 10A it's only 2.5C, which is what should be expected of an ICR at that size, but a similarly sized IMR should push 8-10C. i guess it all depends on what you're using it for, but i'd go with the AW IMR for straightforward 3.7V or for use in a booster setup with that kind of amperage. it's smaller, it's definitely a real IMR, and even that kind of runtime, while not 4000, 10,000, or 100,000 mAh, is probably a lot more accurate and definitely nothing to sneeze at. if you're building a mod around that, let me know, this could sweet!

 

[Switched]

Thnaks for the replies folks.

Pretty much what I surmised Bugg. I thought I would have gotten a few more replies that's all. Can't say why for the time being. The question is legitimate. I ordered 2 and 1. I will conduct my own test

 

[Switched]

As expected I received several PMs and it does appear that the battery that packs more punch is indeed the 26500 AW. Should anyone come across performance charts please link them.

@ Bugg here you go. Didn't know I was going to answer your question so early :

http://www.e-cigarette-forum.com/forum/ikenvape/162278-cat-out-bag.html

 

[buGG]

sounds good, switched; congrats!

 

[Switched]

Thanks man much appreciated.

 

[asdaq]

Sounds like a great project Switched, congratulations indeed, I would only wish to be included on a list for one.

 

[Java_Az]

Here is a one i found on the so called 4000mah. I think the chinies guy in charge of mah testing is either a drunk or using a 50ma led light to run their rating tests.

As you can see from the first chart a 2 amp load brings the battery in @ just a tiny bit over 3000mah. Disgraceful !!!!!! over rating a battery by that much.

Notice how on this chart the two Japan/ Korean made batteries are pretty close to the rated mah. Due to cells losing some capacity over time i would give a 4000 mah about a 300 to 400 mah leeway and the ones around 3000mah 200 to 300 mah with tests at the rated max discharge. 1300 mah under the rating is simply unacceptable, 2700mah for a battery rated @ 10amp max discharge and 4000 mah. There should be a law against this sorta stuff.

 

[Java_Az]

This chart has a AW 18650 IMR in it also a regular li ion. Not the same but gives you an idea about AW ratings , clearly who ever rates their batteries is not a drunk!

 

[Switched]

Thank you so very much folks. Not only did I expect the high rating to be sorta bogus, I prefer the 26500 to maintain things to scale. Thanks a bunch folks.

 

[WillyB]

This chart has a AW 18650 IMR in it also a regular li ion. Not the same but gives you an idea about AW ratings , clearly who ever rates their batteries is not a drunk!

Interesting graph you posted.

Who cares about the accuracy of the mAh? Look at the extreme and rapid voltage drop of AW's IMR. Just plain pathetic. And at only 2A.

 

[WillyB]

@ Java_Az

Decided to check the source of your MNKE graphs. Have to say I was quite disappointed to see the title of the thread "(fake?) MNKE IMR 26650 4000mAh test".

With cells bought from here.

GiGaInternational | Furniture & Electronics

That were these no logo 3.7V marked cells.

As opposed to the certification marked and logo'd ones.

Your first chart was prefaced with this:

edit: Please note, that batteries sold by gigainternational.com are probably fake MNKE cells and not the real ones...

A few more posts from the thread:

I've tested one of each type at the 337 mA discharge rate which is the only rate which can be executed on my older MAHA MH-C777PlusII charger. The discharge routine automatically cuts off at 3.0V I was very happy to observe that the MNKE delivered 4269 mAh while the Batteryspace delivered 4013 mAh. [/QUOTE]

There are many FAKE MNKE IMR cells in the normal markets. They are usually in Blue PVC Coating, and with MNKE printed. This kind of FAKE MNKE is easily seen, and easily Faked.


The furniture store also sells MNKE printed IMR18650 2400mAh and IMR16340 cells that MNKE legitimately doesn't even make.

So sad.

 

[jmanning]

WillyB, that sheds a whole new light on this question! So the legit MNKE cells are actually pretty decent performing cells. The graphs in the datasheets at batteryspace certainly look much better than these.

 

[WillyB]

WillyB, that sheds a whole new light on this question! So the legit MNKE cells are actually pretty decent performing cells. The graphs in the datasheets at batteryspace certainly look much better than these.

The only problem with battery space is they don't show the identifying marks, which means they can swap manufacturers at will. When I emailed them they refused to say their source, nor confirm if the ones from a few months ago are the same ones they sell today.

Here's some pics from RocketMan with the battery space ones. Note he is very safety conscious so he added a protection circuit from a 18650.

Loaded volts with a 2Ω load.

From the cell itself, bypassing any additional resistance the PCB/wiring/switch may introduce. Same 2Ω load.

That's pretty much the volts folks get with their 2000mA powered '5V' PTs with Joye atties.

The range of attys/cartos I normally use is from 2.5 to 3.2 ohms. For a no-frills 3.7 volt mod, this is tops in my book. The volume is bigger than a flashlight mod, but only because it's got square corners.

Tues: I'm 18 hours into it today (3:30AM) and the 2 ohm loaded voltage is 3.68 volts.

Not too shabby for an $11 cell.

As far as the MNKE's, AvidVapor, Cisco's site, sells them. Can't imagine him using junk/untested cells.