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Re: 18650 battery test with capacity curves for many cellsWritten by
jasonck08 on 01-26-2011 02:28 PM GMTGreat overall test comparison. I would like to point out that the tests of the 2900mAh cells were only discharged to 2.80v (not 2.50v). At high discharge currents like 5A there is about 200-250mAh capacity left @ 2.8v.
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 01-26-2011 02:38 PM GMT
jasonck08 said:
Great overall test comparison. I would like to point out that the tests of the 2900mAh cells were only discharged to 2.80v (not 2.50v). At high discharge currents like 5A there is about 200-250mAh capacity left @ 2.8v.
But not all light will be able to use that capacity. Some lights will not even be able to drain the battery down to 2.8 volt, mostly lights with build in protection for LiIon batteries! But not all light will be able to use that capacity. Some lights will not even be able to drain the battery down to 2.8 volt, mostly lights with build in protection for LiIon batteries!
Re: 18650 battery test with capacity curves for many cellsWritten by
jasonck08 on 01-26-2011 03:50 PM GMT
HKJ said:
But not all light will be able to use that capacity. Some lights will not even be able to drain the battery down to 2.8 volt, mostly lights with build in protection for LiIon batteries!
True, but most lights that accept 2 or 3 cells, will be able to drain the cell down to 2.50v. True, but most lights that accept 2 or 3 cells, will be able to drain the cell down to 2.50v.
Re: 18650 battery test with capacity curves for many cellsWritten by
etc on 01-26-2011 05:20 PM GMTMost excellent job here.
Re: 18650 battery test with capacity curves for many cellsWritten by
Vbeez on 01-26-2011 06:28 PM GMTGreat review, as always. Thanks
Re: 18650 battery test with capacity curves for many cellsWritten by
boboweb on 01-29-2011 08:23 AM GMTOutstanding review
HKJ ! You done a lot of hard work - thank you very much !
Re: 18650 battery test with capacity curves for many cellsWritten by
Shinpu on 01-29-2011 08:17 PM GMTexcellent post, thanks for the massive time invested.btw what happened to the Cytac 2600 (blue)?
Re: 18650 battery test with capacity curves for many cellsWritten by
Loben on 01-29-2011 10:39 PM GMTThanks for this review!BTW, where can I get the cytac red 2900 battery?Please show me the link of it!ThanksBen
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 01-30-2011 01:22 AM GMT
Shinpu said:
excellent post, thanks for the massive time invested.btw what happened to the Cytac 2600 (blue)?
They will be added in a few weeks. They will be added in a few weeks.
Loben said:
Thanks for this review!BTW, where can I get the cytac red 2900 battery?Please show me the link of it!ThanksBen
I believe that the batteries are new for Cytac and that they will show up in some shops soon, but due to Chinese New Year I can not ask them just now. I believe that the batteries are new for Cytac and that they will show up in some shops soon, but due to Chinese New Year I can not ask them just now.
Re: 18650 battery test with capacity curves for many cellsWritten by
Colonel Sanders on 01-30-2011 04:20 PM GMTVery nice! And very interesting. Thanks for taking the time to do this. :thumbsup:
Re: 18650 battery test with capacity curves for many cellsWritten by
jorinr on 01-30-2011 08:46 PM GMTThank you for the detailed charts! I have been trying to decide on some new batteries to buy for several of my lights and this helps a lot!
Re: 18650 battery test with capacity curves for many cellsWritten by
radellaf on 01-30-2011 09:51 PM GMTGreat data - thanks for running these tests. The energy loss graph is a new one to me.Any chance of full resolution versions of these pics? Even the 1024 from a free flickr account would help.Is it the Redilast 2600 the one that is maintaining such a high voltage on the 2A curves? There are so many colors it is a bit hard to tell. If so, anyone know if the cell in there is the LG Chem 2600? (since I have some of those, unprotected) For my SST MG P-Rocket I need a slight edge on voltage (to maintain 2.5A on Hi), especially if I can't find a way to charge the special 4.35V cells up past 4.2V. Right now best I could do is buy the 4.35 version of the Microchip 500mA charger IC and the Sparkfun USB charger, but that's $40+, bunch of work, and only 500mA. I'm hoping the Yezl XM-L light is less picky.Overall, if I had to buy more cells, the Tenergy 2600 seem to come off well here, though the diameter might not work in the SC60.
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 01-30-2011 10:50 PM GMT
radellaf said:
The energy loss graph is a new one to me.
Also to me. I wanted a way to visualize the load handling ability of the cells, that was more obvious than the capacity and energy bar. Also to me. I wanted a way to visualize the load handling ability of the cells, that was more obvious than the capacity and energy bar.
radellaf said:
Any chance of full resolution versions of these pics? Even the 1024 from a free flickr account would help.
What is it that you want in higher resolution? What is it that you want in higher resolution?
radellaf said:
Is it the Redilast 2600 the one that is maintaining such a high voltage on the 2A curves? There are so many colors it is a bit hard to tell.
Looking at the chart for Redilast, it confirms that they are good at holding a high voltage at 2A load. Looking at the chart for Redilast, it confirms that they are good at holding a high voltage at 2A load.
Re: 18650 battery test with capacity curves for many cellsWritten by
radellaf on 01-31-2011 11:20 PM GMTThe charts - could email me if you have them readily at hand. I'm just trying to I.D. the lines by color, and at this res the JPEG artifacts make it so I can't do it with the eyedropper tool in Photoshop (to match colors).Mostly, on "Capacity at 2A", I'd like to know which one is holding a higher voltage than all the rest from just past 500mAh out to 2Ah. It stands out. Color could be Redi 2600, but it's so far off from AW 2600 that I don't think that's right.
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 02-01-2011 09:43 AM GMT
radellaf said:
The charts - could email me if you have them readily at hand. I'm just trying to I.D. the lines by color, and at this res the JPEG artifacts make it so I can't do it with the eyedropper tool in Photoshop (to match colors).Mostly, on "Capacity at 2A", I'd like to know which one is holding a higher voltage than all the rest from just past 500mAh out to 2Ah. It stands out. Color could be Redi 2600, but it's so far off from AW 2600 that I don't think that's right.
There are no jpg artifacts in the curves (They are not in a compressed image format). The steps in the curve is the resolution from the CBA (10mV). Here is a chart with a few of the cells: There are no jpg artifacts in the curves (They are not in a compressed image format). The steps in the curve is the resolution from the CBA (10mV). Here is a chart with a few of the cells:
Re: 18650 battery test with capacity curves for many cellsWritten by
radellaf on 02-01-2011 07:15 PM GMTOK, if I download the image, enlarge it, and use the color sampler then yes, color #5555FF is the RediLast 2600. Cool.Anyone know what cell is inside that?
Re: 18650 battery test with capacity curves for many cellsWritten by
darklord on 02-02-2011 05:00 AM GMTDid you ever manage to get a graph for the CYTAC 2600 BLUE....?? These are available here in the UK so I'm interested.You say they were supplied by Cytac for a 'review'....is this the review, or is the review somewhere else??Anyone know or rate this battery?
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 02-02-2011 06:14 AM GMT
darklord said:
Did you ever manage to get a graph for the CYTAC 2600 BLUE....?? These are available here in the UK so I'm interested.
The curves will be added later, but Cytac supplied the wrong batteries (There was 2900mAh in my 2600mAh wrappers). The curves will be added later, but Cytac supplied the wrong batteries (There was 2900mAh in my 2600mAh wrappers).
darklord said:
You say they were supplied by Cytac for a 'review'....is this the review, or is the review somewhere else??
This is part of it, I am also working on something like this with only Cytac batteries, but including some other sizes. This is part of it, I am also working on something like this with only Cytac batteries, but including some other sizes.There will not be any review with test in different lights, but if anybody want to know if a battery fits in a specific light that I have (Many of them can be seen on my website), just ask, and I will check.
Re: 18650 battery test with capacity curves for many cellsWritten by
RepProdigious on 02-02-2011 06:43 AM GMT
HKJ said:
There was 2900mAh in my 2600mAh wrappers
I wouldn't complain if that ever happened to me I wouldn't complain if that ever happened to me
Re: 18650 battery test with capacity curves for many cellsWritten by
LEDAdd1ct on 02-02-2011 01:17 PM GMTThank you for all your hard work!
Re: 18650 battery test with capacity curves for many cellsWritten by
jsr on 02-04-2011 11:02 AM GMTExcellent info HKJ! I don't know where to get most of those cells, but the Tenergy cells are readily available here and lower priced than the Redilast and AW cells and they seem to perform quite well.
Re: 18650 battery test with capacity curves for many cellsWritten by
357mag1 on 02-06-2011 09:45 AM GMTI have Tenergy cells that perform very well and I have Tenergy cells that perform poorly (though better than most of my Ultrafire). I have some AW cells that don't perform that well though they are consistently better than other Chinese cells. Poor quality control plagues all Chinese cells that I have used including Nimh AA - D size.I now only buy Panasonic, Sanyo or LG 18650s and the quality from cell to cell is great. I know they don't have protection but half of my protected cells circuits don't appear to work consistently anyway.I feel safe using quality cells and taking proper precautions. Safer than I do using questionable quality cells with band-aids (protection circuits). It would be awesome if some of the above mentioned unprotected cells could be included in the test.
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 02-07-2011 12:01 AM GMTAW uses Panasonic cells in their 2900 mAh batteries.I would like to add more cells to the test, but I need a place to get them, without paying a fortune in shipping! If anybody has some good ideas, use PM to tell me.
Re: 18650 battery test with capacity curves for many cellsWritten by
Helmut.G on 02-07-2011 11:34 AM GMTanother awesome test HJK!
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 02-08-2011 01:00 AM GMTI got a good link to get unprotected "Panasonic NCR18650 2900mAh" and "Samsung ICR18650-30A 3000", they will be added when I have receive and tested them.Other links or ideas for batteries are welcome.
Re: 18650 battery test with capacity curves for many cellsWritten by
jasonck08 on 02-08-2011 03:14 AM GMTDo you have the equipment to charge a 4.35v cell?
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 02-08-2011 03:48 AM GMT
jasonck08 said:
Do you have the equipment to charge a 4.35v cell?
I have some advanced power supplies, but they would not charge in a predictable way (I would not be able to automatic stop at a minimum current). I have some advanced power supplies, but they would not charge in a predictable way (I would not be able to automatic stop at a minimum current). The best predictable solution I have is some iChargers that can charge to 4.3 volt
Re: 18650 battery test with capacity curves for many cellsWritten by
jasonck08 on 02-08-2011 03:34 PM GMT
HKJ said:
I have some advanced power supplies, but they would not charge in a predictable way (I would not be able to automatic stop at a minimum current). The best predictable solution I have is some iChargers that can charge to 4.3 volt
I saw that the iCharger can charge to 4.20-4.30v. I was wondering if you can also calibrate it incorrectly so it would read 4.30v on the screen but actual charge voltage might be 4.33 or something. 4.30v vs 4.35v there might be 3-5% difference. I saw that the iCharger can charge to 4.20-4.30v. I was wondering if you can also calibrate it incorrectly so it would read 4.30v on the screen but actual charge voltage might be 4.33 or something. 4.30v vs 4.35v there might be 3-5% difference.Also, are there different iCharger models? Can all charge to 4.30v? What model do you have?
Re: 18650 battery test with capacity curves for many cellsWritten by
HKJ on 02-08-2011 03:53 PM GMT
jasonck08 said:
I saw that the iCharger can charge to 4.20-4.30v. I was wondering if you can also calibrate it incorrectly so it would read 4.30v on the screen but actual charge voltage might be 4.33 or something. 4.30v vs 4.35v there might be 3-5% difference.
It is possible to change the calibration, but I do not know if I want to do that. It is possible to change the calibration, but I do not know if I want to do that.
jasonck08 said:
Also, are there different iCharger models? Can all charge to 4.30v? What model do you have?
There a a couple of different models, and the software is nearly equal in all models. I believe all can be adjusted to 4.3 volt, but I have not checked all the manuals. There a a couple of different models, and the software is nearly equal in all models. I believe all can be adjusted to 4.3 volt, but I have not checked all the manuals.I have two 208B: