Test/review of LiitoKala INR26650-50A 5000mAh (Black)

When I said DC internal resistance I mean direct current, not the usually dulled and mostly useless 1KHz AC reading analyzing chargers obtain. Also, the reading at the start of discharge is invalid because the charger measures AC voltage variation injecting AC current into the cell, and I guess it cannot go above maximum cell voltage (and it's there).

To obtain a valid DC internal resistance measurement you need to measure cell voltage variation right at its terminals upon DC current shift out of or into the cell. It can be done with a 4-terminal cell holder, precision power supply or discharge rig, and oscilloscope or precision voltmeter. Without 4-terminal cell holder, the aid of an assistant can help; fellow1 needs to proceed with supply current adjustments while fellow2 needs to hold the multimeter probes at the cell terminals without touching the current leads, and at least one of the two needs to memorize the numbers and do the math.

Diameter is correct as far as I understand. The lenght, however, must be wrong.

Cheers ^:)

Cheers :-)

So you are thinking some Liitokala blue 5100 are real Liitokala and some might be fake Liitokala 5100? This seems possible.

It is a shame for the company. Their blue and back 26650 were so good. Now we have black 26650 going bad. I don’t think I’ll buy them anymore. The new 5100 seems to have very high internal resistance. Things are not looking good for them.

Only their yellow 21700 4000mah Lishen based cell has a good reputation now.

I don’t have the tools to make precision DC resistance measurements. No room in the budget for new toys.

ooops. My dial callipers aren’t metric. Math error. I also have to use sheet of paper to insulate the battery.

2.50669”

~63.67mm - the paper ~63.6mm

Take the sticker off mine and they say INR26650-50A underneath.

There are two “official” LiitoKala stores selling two different 26650s? “Two men say they’re Jesus. One of them must be wrong.”

https://lygte-info.dk/review/batteries2012/LiitoKala%20INR26650-50A%205000mAh%20(Cyan)%20UK.html

https://lygte-info.dk/review/batteries2012/LiitoKala%20INR26650-50A%205000mAh%20(Black)%20UK.html

You can also use your measurement units imho, let people deal with their own issues in this respect if they need to. There are conversion tools everywhere nowadays. I can even convert most of my usual stuff mentally.

Waaay too short for flat top 26650 cells. They usually measure 65mm or a tiiiny bit more. HKJ measured 65 and 65.1mm for the cyan and black cells, respectively. Mangled caliper?

Cheers :-)

It is possible. I bought them at a Navy surplus store sometime around 1982. Carbon fibre Tajima dial calipers. Need to measure some other batteries.

Results from the first analysis are in.

1.5A discharge. —>. 4651mAh
2.0A charge —> 4905mAh

Not good.

My Gold and Black cells all test over 5000mAh on the same C4 at the same 1.5A discharge.

(photo of one earlier in this thread)

5100mAh? Maybe under very special test conditions.

I’ll check the other 3 cells when I can.

Definitively bad stuff. Open dispute and grab all the evidence you're able comparing them to your blacks discharging in the Zanflare C4. Take good photographs. Fight like the Tsar Bomba.

Buying cells from AliExpress, let me say, is maybe even worse than from eBay. At least in eBay you have PayPal which saves your arse. This is not always the case in AliExpress, and raises cost to some extent. AliExpress is great to buy a nice, good fake. :-)

Shockli 5500mAh 26650s with fairly good price at 192led. Can pay with PayPal and shipping is cheap, at least for me. Give it a try if you will, I'm ordering Lii-100 chargers from them already.

Cheers :-)

Yeah, nothing to write home about for sure. :frowning:

Compared to the Original Liitokala 26650’s we first got a couple of years ago…. these suck. :wink:

Hi Barkuti

!!! Please Pay Attention !!!

The Shockli 26650 5500mAh battery from 192led.com are fake, our company never provide any battery to the 192led.com and will not provide them in the future, please be careful of the purchasing.

Please leave message in the forum or email sales@shockli.com for any questions, thanks.

Best regards—Simon

Cell 2 tested. Cell 2 is slightly better but well off what it should be.

1.5A discharge —> 4737mAh
2.0A charge —> 4968mAh

61mΩ impedance.

I am going to post negative feedback on AliExpress for this purchase. Lets see if they publish it.

Do not buy the blue “LiitoKala” cells from aliexpress store 133859

Cell 3

1.5A discharge 4735mAh.

Tell me, and to what threshold level of voltage (v) do you discharge these of your elements?

The Lii-500 charger does all the testing automatically. HKJ says it discharges them to a bit below 2.9v.

Whoops, you are not measuring on a Lii-500. I guess I got mixed up.

Andrew_Debbie, beware! Since you said “C4” I initially thought you had a Zanflare C4 (which is a lot like the Lii-500), but no! You meant to say “ISDT C4”, which is quite bad. See HKJ's review: Charger ISDT C4 @ lygte-info.dk

Quoting Henrik:

[Quote=HKJ in Charger ISDT C4 review]The charger discharges to 3.1V and it looks like it is adjusting the current trying to keep the voltage at 3.1V. [/quote]

:facepalm:

[Quote=HKJ in Charger ISDT C4 review]The batteries are charged, discharged and charged again. The charge is not done correctly it is missing the CV part (See below about software update). … [/quote]

After the update to 1.0.0.11 firmware in the review, with li-ion cell:

[Quote=HKJ in Charger ISDT C4 review]…

A CV voltage has been added to the initial charge in analysis mode and the discharge mode do not slowly reduce current anymore, instead it drops to 0.5A from there sloly reduce current. It looks like the charge failed, there is no CV phase. … [/quote]

It discharged at 1.5A down to 3.35V, reduced ratio to 0.5A, and finished discharge at 3.05V with a slight tapering…

Without charge top-off tests are invalid unless you start with a properly charged cell (at ≈4.2V resting voltage), and since its discharge behaviour is odd I'd definitively mistrust its figures.

Cheers ^:)

Lii-500 goes down to 2.8V, I can say it for sure since it is my analyzing charger. ;-)

Andrew_Debbie is using a ISDT C4, bad stuff. :facepalm:

:-)

I also have an Lii-500. I’ll rerun the Analysis and report back here.

My C4 is running firmware 1.1.0.10. They’ve fixed several problems since HKJ’s review.

The release notes aren’t great….

C4 V1.1.0.10

  1. Improve lithium battery charging.

C4 V1.1.0.9

  1. Improved NiZn battery charging algorithm.
    C4 V1.1.0.6
  2. Add detailed information display.
  3. Add charge current and discharge current setting in analysis and cycle mode.
    C4 V1.0.0.15
  4. Fix the bug of Fan does not stop working when Analysis Done.
  5. Start the fan when USB high power output.
    C4 V1.0.0.14
  6. Fix the bug of Discharge capacity calculation.
  7. Modify the discharge temperature detection exception handling.
    C4 V1.0.0.11
  8. Analysis function optimization
  9. NiMH charge optimization