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

Bunch of reckless pirates , they probably wrapped some Lishen LS21700SA (LiitoKala Lii-40A) cells with 5000mAh rated wraps.

Open a dispute and kick their arses. I would get a half refund 100% for sure.

I don’t think you’re right this time. The accumulators are not the same! The measured capacity is really 5000mAh. I also opened a Liitokala dispute over the Samsung 30Q. I won the dispute. I was refunded 50% of the amount paid. These batteries (versions 4000 and 5000) will not be the same. I have the original version 4000 and a new version 5000 on the way. After delivery I measure and compare them.





What does the bottom of the battery look like?

[quote=Petr J.]


Do you have a link to where you ordered the real 5000ah ones?

The above comment was really unnecessary, I am as right as I can be from this side of the story (and it can also be good to turn left LoL!). The_Fat_Controller didn't posted actual photos of his cells until half an hour ago, he just made a comment. He also didn't say if he measured capacity with a NOR test, and he should because if the cells score low that is valid evidence to win a dispute.

I’ll measure my cells. The original Lii 40 and the new Lii 50. On the Opus BT 3100, this is only an indicative measurement, but will show if there is a significant capacity difference.

I will run Nor test as Barkuti suggested… and see if it confirms the same result
(I may be some time)

liitokala Official Store (Store No. 217753)

That’s the same link i ordered from…. maybe my first charge result was invalid i am running Nor Test right now 115mah in… when it finishes i will post result…

Edit:
Damnn, 4 hours in still above 4v
Edit: uhhh
14 hours in 3.5v

Those yellow ones 5000 mAh are on my radar for some time. Do we know the max continuous amp draw?

2C Max

Standard Discharging Circuit: 0.2C A
Fast Discharging Current: 0.5C A
Max Discharging Current: 2C A
Max. Short Peak Discharge CC: 15A

What could these cells be? The specifications look close to that of Samsung 50E or LG M50, but looks slightly different to both. Maybe some high capacity Lishen 21700?

2C Max - does this mean 2 Amps continuous? That would be too low even for single emitter lights…

C means capacity, this means a 5000mAh (5Ah) battery would be 10A with a 2C rating.

This is new to me, why not to put there just 10 Amps then? Would be interested in learning more about this C rating.

It is not a new system, the advantage is that many batteries sizes/capacities have the same charge/discharge limits when using C rating as long as they use the same chemistry.
Once it was very common to see 2C discharge and 0.5C charge rate for LiIon and it is still a good and fairly safe guess if the only specification you have is capacity.

Disappointing! these are clearly not the same cells Petr J got

Wow that sucks. I guess i was lucky with the 50A 26650’s, both were measured at over 5600 mAh. The lottery with non-japanese made 21700s is pretty frustrating.

To answer your earlier question, I think you removed it, some manufacturers measure capacity from 2.5v to 4.2v. I was hoping HKJ would answer you as he’s the resident expert an batteries.

Since he didn’t, I looked up a couple of data sheets. Here is a quote from the Sanyo 3400mah GA data sheet.

“Capacity is measured by the discharge at 0.67A until end voltage of 2.5V after fully charged at 25℃ as described in the specification.”

Here is from a Samsung 40T.
“Standard discharge capacity is the initial discharge capacity of the cell, which is measured with discharge current of 800mA(0.2C) with 2.5V cut-off at 23℃ within 1hour after the Standard charge.”

So this quick sampling shows they go down to 2.5 volts. I think HKJ might only go down to 2.8, I’m not sure. I don’t think there’s much difference between 2.5v and 2.8v.

If you only let it discharge down to 3.4v then there is a bit more capacity left. Looking at a random 5000mah 21700, the LG M50, I see HKJ measures about 4,000mah at 3.41v at 0.5A discharge. As it goes down to 2.8 it gains another 800mah or so. Same for the Samsung 50E and 48G. They all gain another 700-800 mah from 4.1v to 2.8v. So I would guess your cells would read about 4700-4800mah if you discharged them further.