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Liitokala Engineer Lii 500 Charger
#31
I have the same +10% reporting on my Lii 500's

I have seen some people that stand the Lii 500 on end, but have not tried this myself.

Some other observations:

I also notice the the Lii 500 does not do that good a job when some ports are charging and the others are discharging.

If at the start of the discharge cycle, the cells are out of balance (Ex 3.8v * 3.6v, 60 minutes latter the cells are in balance both at 3.5v). If each port was independent, the cells would continue to have a different nominal voltage through the test cycle.

I wonder if it would be possible for evaluation to use alligator clips and wire to move the battery into a standard cell holder, away from the heat to see if there is a different behavior
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#32
Just added my iMax B6 to the testing mix. This one, however, has a not-adjustable cut-off voltage of 3.0V
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#33
(05-19-2019, 03:41 PM)thanar Wrote: Just added my iMax B6 to the testing mix. This one, however, has a not-adjustable cut-off voltage of 3.0V

On the Li-Ion program, the cutoff is 2.5v
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#34
(05-18-2019, 04:18 PM)thanar Wrote: I did some more tests on both the Lii-500 and the dedicated discharged. When set to discharge at 500mA, both actually do so at 510-515mA steady, which I guess is OK. Both clocks work fine, so I don’t get it why the results differ by almost 10%. I mean, Ah calculation is just (constant current) x (time), should be almost the same! The only noticeable difference is that when the cell is discharging on the Lii-500, it gets around 10deg over the ambient temperature (18 deg. C), since it’s sitting on the warm charger, while the dedicated discharger has a separate holder for the cell:
@thanar

So I ran some cells through the Lii-500.
1 ICR18650-26D and 3 ICR18650-28A

I came up with these numbers:
ICR18650-26D 2250mAh
ICR18650-28A 2212mAh, 2079mAh, and 2309mAh.

I ran them through my SKYRC at 500mA/500mA C/D and 50mA charge cut off at 4.2V and 2.8V cut off.
The ICR18650-26D came up with a ~ 1850mAh result and the other cells"ICR18650-28A where within a 5% margin.
Odd.
I did not record them as it was early in the morning and I forgot Dodgy

But I am running the test again and wont forget to record it this time. Big Grin


Wolf
thanar likes this post
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
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Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
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#35
I've found that when testing cells on all four bays of Lii-500 the cells get considerably hot, hence I have decided to only use bays 1-3 or 2-4 when testing. This way the cells stay at a normal temperature, around 10 degrees higher than the ambient.
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#36
[Image: tcwxzl2.jpg]
The encircled is not electrolyte leakage, it's thermal compound and the one sticking up is a thermistor.
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#37
(07-18-2019, 12:51 PM)barns Wrote: [Image: tcwxzl2.jpg]
The encircled is not electrolyte leakage, it's thermal compound and the one sticking up is a thermistor.
So you looked at one picture and decided to teach me what is what LOL.
Look on the other pictures before comment where you can see the electrolyte, the encircled space is where it was in short with the electrolyte...

(05-21-2019, 10:29 AM)thanar Wrote: I've found that when testing cells on all four bays of Lii-500 the cells get considerably hot, hence I have decided to only use bays 1-3 or 2-4 when testing. This way the cells stay at a normal temperature, around 10 degrees higher than the ambient.
I added a 80mm fan on mine, now is cool but noisy LOL.

(11-09-2018, 05:06 AM)Charly144 Wrote: After nano protect, does it work again?
Yep, still working since then.
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#38
I just added some cooling to discharging mosfets. No heat anymore...



                         


       
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#39
Hrmm, maybe a bit overkill there bud Tongue
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Proceed with caution. Knowledge is Power! Literally! Cool 
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#40
(10-11-2019, 02:49 AM)Korishan Wrote: Hrmm, maybe a bit overkill there bud  Tongue

Yeah i dont have small heatsinks - and im too lazy to cut it Smile
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