Callie's Kustoms 18650 battery

Sent to me for testing by Callie's Kustoms

Battery has protection circuit
Length is 68.9mm
Diameter is 18.5mm @ widest point .

Now these Batteries are built on the Panasonic 3100 cell , which is the latest release from Panasonic and they are 4.2v , and can be discharged down to 2.5v . A lot of flashlights will not be able to take advantage of this lower voltage capability as they have built in discharge protection @ 3v . But for a few lucky people , who may have buck boost low voltage drop ins , like the Solarforce 0.8v - 4.2v , will have the ability to suck these batteries dry .

Discharging the battery in my Imax B6 @ 0.5A , I got some 2700mAh from 4.2v to 3v , and some



2919mAh when discharged all the way down to 2.5v @ 0.5A . I did use the Nimh setting as it allows a much larger voltage variation for discharge , for the , to 2.5v discharge .

For comparison :
Hi-max 2600 = 2379mAh @ 0.5A to 3v
Xtar 2600 = 2448mAh @ 0.5A to 3v
Samsung 28A = 2488mAh @ 0.5A to 3v
Sanyo 2600 = 2433mAh @ 0.5A to 3v





The last graph is the run time test in my MTE SSC P7 , and please take note that after 120minutes I have gone in 10 minute steps rather than 5 minute steps .

The other batteries begin to fall of around the 60 minute mark and seriously lose power , while the Callie's Kustoms 18650 continues to deliver power . Now the CK 18650 still has good reserves of power even with the voltage dropping of and running Direct Drive [ Which the MTE is ] , means that Voltage plays a large roll in output . For those folks running Buck boost or regulated lights [ Light maintains a steady output as long as possible ] will see much better gains from running a high capacity battery than those folks running Direct Drive .

Who would benefit from a CK 18650 , well just about anyone , but I can see a real purpose for this battery with anyone requiring light for as long as possible , Police , Search and Rescue , Med Techs , etc . When lives are on the line those 30 or more extra minutes of run time , could be the difference in some ones life . Who said ? what is your life worth ?

If we average out the run time for the other batteries at 80 minutes , the Callie's Kustoms 18650 [ in this light ] takes you to 140 minutes , that's a gain of some 60 minutes over 80 minutes , and in my book , that's one hell of a gain . And if you look at the discharge test [ Current with various lights ] , you can see the CK 18650 compares well to the other batteries I have tested recently .

Thank you Calie's Kustoms for allowing me to test your battery ,

old4570

I'm pretty keen on this panasonic 3100mah cell. Thanks for the review!

Thanks for the review! Need to sell a few things first, but I intend to buy a pair.

Wow, just checked out the website for these cells and the prices are competitive with AWs. Does anyone know offhand what an AW 2900 really has in it? I'm waiting on one of download's Pocket Rockets and I'll be feeding it the best I can lay hands on (protected). These Kustoms look like a real winner.


*edit*

Just found this......
http://www.candlepowerforums.com/vb...tery-test-with-capacity-curves-for-many-cells

'bout the same really

/end hijack

I believe I'm going to have to check some of these out! Thanks for the review.

AWs 2900 has the Panasonic NCR18650 2900 mAH cell and the CK is using the newer NCR18650A 3100.

Old 4570 what's the max discharge current you can test at with that imax b6?

VegasF6 said:

Old 4570 what's the max discharge current you can test at with that imax b6?

Click to expand...

Specifications:
* Operating voltage range: DC11.0-18.0 Volt / AC to DC adaptor(DC11.0-18.0V/5A)
* Circuit power: Max.charge power 50W / Max.discharge power 5W Charge Current Range: .1~5.0A
* Discharge current range: 0.1-1.0A
* Current drain for balancing Li-po: 300mAH/cell
* LiIon/LiPo/LiFe cells : 1-6
* NiCd/NiMH cells : 1-15
* Pb battery voltage: 2~20v
* Net Weight: 277g
* Unit Package Gross Weight: 580g
* Dimensions: 133x87x33mm

Norm

I will try and post some higher current discharge graphs tomorrow, if this stupid computer doesn't blow up again.

1A max discharge ... Imax B6

If you want 5A discharge , I checked Ebay , and the price entry point is about $75 ... [ Something like the Imax B8 ]

I am testing now but no data to post for awhile still. Rolling power outages here too. Hope I don't lose power in the middle of testing. Starting at 3.1A then will try a 5 amp discharge. I would like to see data for 6.2A discharge but I don't have the capability. Or even ~9amp. What would be the likely effect of such a high discharge rate. Potential flames?

*edit* jumping the gun a little here but one result, at 3.1A voltage quickly sags to ~3.5

Here is the first graph, a 3.1A discharge of one cell down to 2.5V.



Like I said above, voltage immediately sagged to 3.49.
Also note that a discharge to 2.8V would have yielded 2,374 mAH. Normally I would stop my discharge tests there, or sometimes even higher. But, I wanted to give these new chemistry cells a fair chance. So, in this case, the test terminated at 55 minutes and 56 seconds at 2.503V for a total of 2896 mAH. Not too bad at all, would be great for an XM-L.

The cell did warm up some and what really surprised me was the stack or rare earth magnets I had at the negative connection really got warm. I have a single magnet soldered to 12 AWG wires less than 12 inches long for testing to minimize resistance, but the magnet wasn't strong enough to get a good grip at the circuit board so I added a stack of thinner magnets. They were very warm. Have to come up with a better connection method.

Here are results of a "5 amp" test. The quotes are because the charger didn't really sink the full 5 amps until 25 minutes in or so. So it's more like 4 -5 amp test, but I guess that's the best my charger can do. I improved the magnetic connection but there was still a significant amount of heat at the negative connection. I don't know if this is a problem or not but I am starting to be quite concerned by it, something in the protection circuit heating up or the traces in the circuit board simply can't handle the power.



The cell achieved 2992 mAH over a 38 minute period. Which seems awfully good. This test is only as accurate as my iCharger, I have seen others say that it's not nearly as accurate as say the West Mountain CBA.

I have done a total of 1 cycle each on these cells as documented here. Besides warming up while discharging, I have noticed they both settle down to ~4.11V soon after charging. I am concerned these are signs of high internal resistance with these cells. I am not so certain how I feel about them at this point.

Hmmm ,

Oh man I had a carefully worded response and the power went out ..

What charge rate ? End voltage ? Sag ?

I just wonder if the high discharge rate to 2.5v had something to do with it , as Li-ion batteries are susceptible to damage at high current bellow 3.5v .

Taking a brand new cell , and pushing it hard ?

So far mine is acting very normally , I will use it as much as possible to see how it goes ..

Currently in my L2T XM-L T6

Yah, I hear ya there, but cell #1 had 1 discharge at 1C. I wouldn't consider 1C pushing it hard. Most cells I wouldn't discharge to 2.5V but then the NCR18650A isn't most cells. Panasonics discharge graphs show to 2.5V and I have read time that there proprietary coke lithium blah blah is designed to run down to that voltage (at least under load, I wouldn't want resting voltage that low). Supposedly max discharge is 6.2A to 2.5V, standard charge current is 1650 mA. Check out this data sheet for the older 2900 cells, I never noticed seems like they have a pretty short life cycle dropping off immediately and the chart ends at 300 cycles at a relatively gentle 1C rate. Is that typical of other 18650 cells?

Charge rate was 1.2A, end voltage 4.2 pretty much spot on. As soon as charge stopped, before I unhooked the iCharger it dropped to ~4.17 - 4.18. After about 2 hours I checked cell #1 again at 4.11V.

What sort of discharge rates does your L2 XML pull? No sign of warmth? Have you done an extended discharge yet in a high current flashlight?

*edit*
just noticed I never included link to data sheet. The graph entitled typical life characteristics at the end is what I refer to.
http://industrial.panasonic.com/www-data/pdf2/ACI4000/ACI4000CE17.pdf

I do recall that my 2900 Panasonic cells started to give up (and eventually vented brown goo) after about 10-20 cycles through my 2.8A kerberos triple (were charged on a WF-188 @ 650mA)

I discharged the cell twice to 2.5v @ 0.5A - I would not want to go higher to 2.5v , to 3v I would consider higher AMPs

I did a runtime test , last graph , SSC P7 Direct Drive on High , this is to give folks an idea of how the battery behaves in a light to 3v .
2nd last graph shows discharge current achieved in different lights ..

I would suggest a lower charge current , especially towards the end , those cheap chinese chargers sometimes have there advantages .

A high charge current much like a high discharge current can put a load on the battery giving a different state to when at rest .. So it can be as simple as the cell normalizing to a rested state [ And yes , the higher the charge rate the more resistance will be met from the battery - this being variable some what to individual cells ] , you will note the Voltage drop when discharging a cell , the higher the discharge current , the greater the voltage drop .

Can we say the same for charge rates ? the higher the current the higher the voltage state under load ? once the load is removed , the battery normalizes its resting voltage .

Great thread !


Thank you for the Review and Information.



:goodjob::thanks:
_

old4570 said:

.
Can we say the same for charge rates ? the higher the current the higher the voltage state under load ? once the load is removed , the battery normalizes its resting voltage .

Click to expand...

Perhaps, but the difference is the discharge rate remains the same more or less until cut off, but the charge rate only remains the same through the initial CC stage, when the charger enters the CV topping stage, the slow part, charge current steadily decreases until shutoff at ~50mA. Spec sheet notes 1.65A initial charge rate for slow charge or 3.1A for fast charge. But then again, the white papers I linked to above shows testing at .3C charge rate of only 825 mA. I will try that in the morning after a gentle discharge.

Thanks for the advice!

I only used my Imax B6 once to charge a 18650 @ 1A , and noted something similar .

Charger showed that it stopped charging at 4.2v , but once out it was about 4.19v , and after one hour it was 4.15v ...

The cheap chinese chargers seem to taper of the charge current a lot more towards the end , and possibly as low as 40mA or there a bouts as it terminates or gives the green light to show charging is complete .

Most of mine might do 650mA to start and by the time you get to 4v the charge current has seriously dropped of to maybe 200mA , and so forth continuing to drop charge current as the cell approaches 4.2v

Im not sure how long it takes a battery to normalize ? But with the cheap chinese jobs its one hour .. And thats starting @ around 650mA charge rate and slowly tapering off .

So whether charge rate - initial or end affects it by how much ?
Certainly something to explore if one had the time and a programmable charger .

I suspect the reason the cheap chargers [ for me ] do a better job is [ maybe ] as the charge tappers of , the battery begins to normalize - while the charger is still charging at an ever lower current .

So as the battery voltage lowers [ normalizes ] the charger is still charging at a low current bringing the charge up to 4.2v ..

What the hobby charger might do is maintain a charge rated , and back of the charge current at a certain point and bring the battery to 4.2v before it has had a chance to normalize , and therefor the drop in voltage after charging . ?

Well thats what I suspect ... Ive been known to be wrong often enough ! And I entertain the idea I may be so now - but at this time I dont know any better !