Samsung 22p battery testing it with capacity checker and is something wrong

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davehusk

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Oct 21, 2021
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I have over 100 Samsung 22p which are 10A discharge and no more than 2200mah

I have one on the capacity checker with two of the resistors on an aluminum heatsync

Started at 4.18v, correctly at 3.52v, with a 1.106 A load (started at above 2A, as voltage lowered so did the load, but according to the checker, I'm at 3600 mah right now how is this possible according to data sheets this shouldn't be possible
 

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Overmind

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If you test capacity when charging, the test is useless, it can vary a lot depending on the quality, state of the cell, temperature, many other things.

Your tester should fully charge, then test on discharge to measure capacity. That value is then relevant with little other influence.
There is no way you can get more than 2300mAh for these cells.

If you said you started at 4.18 and tested on the discharge then it must be something very wrong with your tester.
 

davehusk

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Oct 21, 2021
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I charge batteries first to whatever their voltage should be.

Besides that how am I getting 4mah using 1C on a Samsung 22P then I run a 28A it shows 2850. So I know what I'm doing is right. But every 22P I got, not 22B, or 30 a or 30b or even 32a goes to over 3.8mah

I know the specs, I'm building a 13s6p BMS out of 22p, another from13s 4p 25r and 28a 13s 10p

I have all kinds of lg, sanyo, but every 22p says online 10A discharge max and 1900 to 2150 mah.

Your response had clothing to do with what I asked
 

OffGridInTheCity

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I use OPUS testers (primarily) and over 10,000 cells - they never test above spec other than the normal +/- of such testers. (e.g. 100mah) This has been proven out in another way as the charge/discharge capacity (ah in / ah out) while using the cells in the powerwall.
From another angle - 3600mah is just about the theoretical max of 18650 technology and Samsun 22p(s) are not at the top end capacity wise. :)

So yes - something is wrong if you're getting 3600mah for a 2200mah (speced) cell. Here's a reasonable spec sheet on Samsun 22p - https://secondlifestorage.com/index.php?threads/samsung-icr18650-22p-cell-specifications.1773/ just for the sake of documenting this discussion.

>Started at 4.18v, correctly at 3.52v, with a 1.106 A load (started at above 2A,
I don't understand the '3.52v' comment or the 1.106a / 'started at > 2a' comment - maybe you could explain a bit more you're test procedure / equipment? Are you starting at a 2a load and then it somehow reduces to a 1.106a load?

Most of us charge up 100% and then apply a steady 1a load down to a 2.85v cut-off to get a capacity reading as this is how standard OPUS like testers work.
 
Last edited:

davehusk

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I thought it could be where the load is actually 2x7.5 ohm resistors in parallel. So ohms law doesn't work because load changes depending resistance which is calculated by voltage.

Any ideas I can use instead. I can use a multi-meter but what do you suggest the load, think loading a little fan and measure the ah of the load to be for every battery model has a different value for 1C.

Please how can I use this tester that has 2x 7.5ohm resistors that get warm I have attached to heatsync. I charge battery, cool for10 min to settle and then put in the low voltage cutoff and press calc ok
 

OffGridInTheCity

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Unfortunately I don't understand what you're doing / using resistors as loads / match involved etc. That's why I used OPUSs :)
Looks like a USB charging (discharging?) board with resistors in the circuit.

Maybe if you share more detail (what are the boards, what's the circuit diagram, example math you're using) someone will comment. There are experts at this level on the board from time to time but unfortunately I'm not one of them. .
 

Wizzie2k

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I recognize the ZB2L3 board you are using, I have used the same myself and from what I can see in your photos, all seems to be correct. And I see that the 22P cell has the date code ending with T instead of a digit. Right now I have a lot of 29E cells also with date code ending with a T and they are as well testing higher than the specs for it, not as high as yours, but definitely higher. Have gotten a new batch of Samsung cells recently and I have some of the 22P cells with the date code ending with a T as well. Have put a couple of them on a CDC test right now to see what results I get. Will get back to you when they are finished.
 

davehusk

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Oh it's a capacity measurement for 1 lithium ion or up to 3 new same batteries you can set the low voltage cutoff then you press ok. I used 1 cell so I chose 3.0
 

davehusk

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I recognize the ZB2L3 board you are using, I have used the same myself and from what I can see in your photos, all seems to be correct. And I see that the 22P cell has the date code ending with T instead of a digit. Right now I have a lot of 29E cells also with date code ending with a T and they are as well testing higher than the specs for it, not as high as yours, but definitely higher. Have gotten a new batch of Samsung cells recently and I have some of the 22P cells with the date code ending with a T as well. Have put a couple of them on a CDC test right now to see what results I get. Will get back to you when they are finished.
That's amazing!! Every one of these came from Dell or HP laptops I think when they were at battery lasting longer war. Because I remember adding up in my head the village of the pack, wh, and capability and did it out and the numbers matched mine
 

davehusk

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The board takes a micro usb to turn on the calculation processes that use the sensors to watch the circuit of one 18650 battery fully charged with a 15ohm constant load, press ok or alternates between current voltage of battery, then the load measured in A and when the consulate of the 18650 battery hits3.0 with load on, it calculates capacity with each jump between V to A to Ah
 

davehusk

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Watch that it will explain my tester
 

Wizzie2k

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Have tested a couple of 22P cells now but they all are within spec. Have you changed any of the settings on the ZB2L3? Cant that be the problem?
 

davehusk

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Have tested a couple of 22P cells now but they all are within spec. Have you changed any of the settings on the ZB2L3? Cant that be the problem?
What settings. I thought you just press low voltage number then ok and it runs through
 

davehusk

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What settings. I thought you just press low voltage number then ok and it runs through
I was using 2 of the 7.5ohm resistors attached to heat sync, so I'm doing a test now with just the one block resistor. I know it can handle up to 12v, and the load on 3 18650s would be bigger

And I'm testing on a brand new just charged out of a box simple LG that's 2200 mAh guaranteed
 

davehusk

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I was using 2 of the 7.5ohm resistors attached to heat sync, so I'm doing a test now with just the one block resistor. I know it can handle up to 12v, and the load on 3 18650s would be bigger

And I'm testing on a brand new just charged out of a box simple LG that's 2200 mAh guaranteed
I set lvc always to 3v
 

davehusk

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I attached pics of the current run so far.

Can anyone tell me this looks normal
 

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davehusk

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I use OPUS testers (primarily) and over 10,000 cells - they never test above spec other than the normal +/- of such testers. (e.g. 100mah) This has been proven out in another way as the charge/discharge capacity (ah in / ah out) while using the cells in the powerwall.
From another angle - 3600mah is just about the theoretical max of 18650 technology and Samsun 22p(s) are not at the top end capacity wise. :)

So yes - something is wrong if you're getting 3600mah for a 2200mah (speced) cell. Here's a reasonable spec sheet on Samsun 22p - https://secondlifestorage.com/index.php?threads/samsung-icr18650-22p-cell-specifications.1773/ just for the sake of documenting this discussion.

>Started at 4.18v, correctly at 3.52v, with a 1.106 A load (started at above 2A,
I don't understand the '3.52v' comment or the 1.106a / 'started at > 2a' comment - maybe you could explain a bit more you're test procedure / equipment? Are you starting at a 2a load and then it somehow reduces to a 1.106a load?

Most of us charge up 100% and then apply a steady 1a load down to a 2.85v cut-off to get a capacity reading as this is how standard OPUS like testers work.
3.5 volts, running ohms as load changes as voltage drops
 

davehusk

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Oct 21, 2021
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I use OPUS testers (primarily) and over 10,000 cells - they never test above spec other than the normal +/- of such testers. (e.g. 100mah) This has been proven out in another way as the charge/discharge capacity (ah in / ah out) while using the cells in the powerwall.
From another angle - 3600mah is just about the theoretical max of 18650 technology and Samsun 22p(s) are not at the top end capacity wise. :)

So yes - something is wrong if you're getting 3600mah for a 2200mah (speced) cell. Here's a reasonable spec sheet on Samsun 22p - https://secondlifestorage.com/index.php?threads/samsung-icr18650-22p-cell-specifications.1773/ just for the sake of documenting this discussion.

>Started at 4.18v, correctly at 3.52v, with a 1.106 A load (started at above 2A,
I don't understand the '3.52v' comment or the 1.106a / 'started at > 2a' comment - maybe you could explain a bit more you're test procedure / equipment? Are you starting at a 2a load and then it somehow reduces to a 1.106a load?

Most of us charge up 100% and then apply a steady 1a load down to a 2.85v cut-off to get a capacity reading as this is how standard OPUS like testers work.
Any ideas how to get a1amp exact load. I want to make my own charger and tester. Anyone got any diagrams. I've plenty of boosters cc and CV I think though these types of batteries go cc for so long then cv last going off...

My charger came from a vape store, it holds 6 cells, and charges at 0.68A with all 6, but you can press a button and have the middle two cells charge at 2A
 

Oberfail

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Any ideas how to get a1amp exact load. I want to make my own charger and tester. Anyone got any diagrams. I've plenty of boosters cc and CV I think though these types of batteries go cc for so long then cv last going off...

My charger came from a vape store, it holds 6 cells, and charges at 0.68A with all 6, but you can press a button and have the middle two cells charge at 2A
save the hassle and just buy a normal charge/discharge/charge charger to test them, like a opus or liitokala if you want it a bit cheaper
 

davehusk

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save the hassle and just buy a normal charge/discharge/charge charger to test them, like a opus or liitokala if you want it a bit cheaper
Thanks. Do you have a decent site that's not a cheap knockoff or whatever? Please
 
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