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Queen Battery QB26800 6800mAh 20A - the big guy!
#1
Video 
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.
[Image: 225620_original.jpg]

The battery was bought from Queen Battery which is my reliable supplier of genuine cells and tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
[Image: 87638_original.jpg]

I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals
[Image: 210421_original.jpg]
[Image: 209931_original.jpg]

I've followed all the prescriptions of the IEC61960-2003 standard 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 23.0-24.5°C. To be sure in results i've done each test minimum 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.
[Image: 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: ≤10mΩ
Weight: 121±3g

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

Measured weight of the tested cell was 116.18g
[Image: 226186_original.jpg]

Capacity test results:
[Image: 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:
[Image: 225131_original.jpg]
[Image: 224781_original.jpg]

Also the 3.0V discharge cut-off should not be a problem for most BMS boards i think. So at the end of the day we have a big cell with great performance and high capacity. According to its datasheet the cycle life is 500 cycles at 1C/1C charge/discharge, 100DOD down to 90% of capacity and 1500 cycles at 0.5C/0.5C, 100DOD, down to 80%.

Here is the video version of this review:
[Image: 225405_original.jpg]


Check out my YouTube channel for batteries, chargers and other stuff reviews.
I've launched my blog where you can find all my reviews in one place. Every new test/review will be first published on YouTube and in the blog. I'll be happy to see new subscribers, comments, suggestions and just your thoughts.
Korishan, hbpowerwall, DCkiwi And 5 others like this post
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
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#2
Always helpful Thunderheart!
Korishan, DCkiwi, thunderheart like this post
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#3
Thanks Headrc!))
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
Reply
#4
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?
The power of lithium ion is in our hands!
We'll show them what we're made of!
Reply
#5
(01-22-2019, 03:36 AM)BlueSwordM Wrote: 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 AliExpress store. They seem to have a shipping method to Canada.
Reply
#6
(01-22-2019, 03:36 AM)BlueSwordM Wrote: 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?
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
Reply
#7
(01-22-2019, 07:54 AM)thunderheart Wrote:
(01-22-2019, 03:36 AM)BlueSwordM Wrote: 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 Wrote:The total Watt-hour rating (Wh) for each cell must not exceed 20 Wh per cell.
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#8
(01-22-2019, 07:42 PM)mike Wrote:
(01-22-2019, 07:54 AM)thunderheart Wrote:
(01-22-2019, 03:36 AM)BlueSwordM Wrote: 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 Wrote: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
Building Lifepo4 Powerwall - atm 1400 cells growing

Reply
#9
@Geek, holy crap.

Finally someone that ships cells at reasonable prices Smile
The power of lithium ion is in our hands!
We'll show them what we're made of!
Reply
#10
(01-22-2019, 03:36 AM)BlueSwordM Wrote: Wait a minute... [...] 2. Since it exceeds 20Wh in capacity, how did it actually get shipped to you?


(01-22-2019, 07:54 AM)thunderheart Wrote: [...] 2. What's the problem with >20Wh cells?


(01-22-2019, 07:42 PM)mike Wrote: It might just be a US post office thing, not sure if it applies to any other country or shipping carrier?

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


(01-22-2019, 09:11 PM)emuland-metroman Wrote: 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
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