Queen Battery QB26800 6800mAh 20A - the big guy!

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thunderheart

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Apr 4, 2018
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26800 is a new format of cylindrical cells. It means 26mm in diameter and 80mm in length. Queen Battery QB26800 is rated at 6800mAh and can be discharged at up to 20A continuously.
225620_original.jpg


The battery was bought fromQueen Batterywhich is my reliable supplier of genuine cells and tested withZKETECH EBC-A20and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
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I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals
210421_original.jpg

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I've followed all the prescriptions of theIEC61960-2003standard concerning battery's capacity measurement. Before each discharging cycle the battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hr pause. The environment temperature was 23.0-24.5C. To be sure in results i've done each testminimum twice(usually 3-4 times).


Queen Battery QB26800 6800mAh
The cell is marked as QB26800 6800mAh 3.7V. No data about production date or batch number.

226409_original.jpg


The main specifications from QB26800's datasheet*:
Capacty:6800mAh
Nominal voltage:3.6V (on the battery there is a 3.7V notice)
Standard charge current:6.8A (1C)* (i charged at 5A, which is the max charge current of my tester)
Maximum charge current:13.6A (2C)
Charge cut-off current:340mA (0.05C)*
Charge end voltage:4.20V
Max continuous discharge:20.4A (3C)
Max pulse discharge:34A (5C) for <30s
Discharge cut-off voltage:3.0V*
AC impedance at 1KHz:≤10mOhm*
Weight:1213g

Measured initial DC IR at 6.8A in fully charged condition was 16±0.3mOhm

Measured weight of the tested cell was 116.18g

226186_original.jpg


Capacity test results:
225905_original.png

Pay attention to the discharge cut-off voltage - it's 3.0V* while the majority of cylindrical Li-ion cells' end on 2.5V or 2.75V.
At 0.2C (1.36A) QB26800's capacity appeared to be noticeably higher than 6800mAh - it's 6930mAh. The curves look good and smooth. At 20A the capacity was still above 6200mAh and the energy more than 20Wh.
Of course the results could be higher if it was discharged down to 2.5V but once the manufacturer says cut-off is at 3.0V i have to use that number.

The cell's length could be a problem for those who are going to charge it in a charger but i think these batteries will mostly be used in battery packs so the length is not a problem.
Look at it in comparison with 21700 and 18650 cells:

225131_original.jpg

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Update!
The test was done using the very first version of datasheet available at the moment but later it was updated twice and here is a table with differences between datasheet versions:
Image


Here is the video version of this review:


Check outmyYouTube channelfor batteries, chargers and other stuff reviews.
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Last edited:

BlueSwordM

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Jul 5, 2017
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423
Wait a minute...

1. That cell is absolutely massive. It will not fit any lithium-ion charger that uses a battery holder.

2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?
 

Geek

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Aug 15, 2017
Messages
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BlueSwordM said:
Wait a minute...

1. That cell is absolutely massive. It will not fit any lithium-ion charger that uses a battery holder.

2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?

Queen battery has an AliExpressstore. They seem to have a shipping method to Canada.
 

thunderheart

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Joined
Apr 4, 2018
Messages
275
BlueSwordM said:
Wait a minute...

1. That cell is absolutely massive. It will not fit any lithium-ion charger that uses a battery holder.

2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?

1. Absolutely right. It's for building packs.

2. What's the problem with >20Wh cells?
 

TheBatteries

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Oct 8, 2016
Messages
2,116
thunderheart said:
BlueSwordM said:
Wait a minute...

1. That cell is absolutely massive. It will not fit any lithium-ion charger that uses a battery holder.

2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?

1. Absolutely right. It's for building packs.

2. What's the problem with >20Wh cells?


It might just be a US post office thing, not sure if it applies to any other country or shipping carrier?

USPS Regulations said:
The total Watt-hour rating (Wh) for each cell must not exceed 20 Wh per cell.
 
Joined
Aug 10, 2018
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mike said:
thunderheart said:
BlueSwordM said:
Wait a minute...

1. That cell is absolutely massive. It will not fit any lithium-ion charger that uses a battery holder.

2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?

1. Absolutely right. It's for building packs.

2. What's the problem with >20Wh cells?


It might just be a US post office thing, not sure if it applies to any other country or shipping carrier?

USPS Regulations said:
The total Watt-hour rating (Wh) for each cell must not exceed 20 Wh per cell.

same in EU. 20 wh cell limit or special shipping for dangerous goods
 

BlueSwordM

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Jul 5, 2017
Messages
423
@Geek, holy crap.

Finally someone that ships cells at reasonable prices :)
 

DCkiwi

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Sep 11, 2017
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BlueSwordM said:
Wait a minute... [...] 2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?


thunderheart said:
[...] 2. What's the problem with >20Wh cells?


mike said:
It might just be a US post office thing, not sure if it applies to any other country or shipping carrier?

USPSRegulations said:
The total Watt-hour rating (Wh) for each cell must not exceed 20 Wh per cell.


emuland-metroman said:
same in EU. 20 wh cell limit or special shipping for dangerous goods


come on people

please give us some example references. we're curious folks.


[to-all] and let's keep this forum clean please. it is non-trivial to quote nested quotes. lol.



peace
/DCkiwi
####like. vote. be an OP. register. donate. sandbag. all good.
 

Korishan

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Jan 7, 2017
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So basically, according to this, if it's labeled as a "battery", then it can be up to 100Wh.


image_qbybpq.jpg


But only 2 max in the package. So that still might make shipping a bit pricey.
 

thunderheart

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Apr 4, 2018
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Checked on the web for any restrictions in Russia and didn't find any))). Democracy rules, LOL))))))))))))))))))))
 

RikH

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Nov 22, 2018
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thunderheart thanks for this nice review. I have some questions:

  • Did you test only one?
  • Did you measure the outside?
I'm curious if they will fit in these holders size 26,3 mm. Think these are very interesting for building a powerwall.

Thanks in advance!

Rik
 

100kwh-hunter

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Mar 2, 2019
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aah i miss the good old days that you just could order a stick of dynamite.
:) :)
I would love to get my hands on 6 or 12 of them for in my power tools.(not the dynamite that is)
 

thunderheart

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Apr 4, 2018
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275
RikH said:
thunderheart thanks for this nice review. I have some questions:
  • Did you test only one?
  • Did you measure the outside?

Dank je Rik!
Yes, i've tested one cell
The outside is 26.5mm measured by my digital caliper

100kwh-hunter said:
aah i miss the good old days that you just could order a stick of dynamite.

:D
 

thunderheart

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Apr 4, 2018
Messages
275
After publication of my test another 2 versions of datasheet came out and i summarized the differences in a table and updated the article.
 
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