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Queen Battery QB26650-2300 LiFePO4 cell's test + comparison to A123 ANR26650M1B
#1
Video 
QB26650-2300 is the second LiFePO4 model from Queen Battery. The 2500mAh cell i tested recently and i'll compare the two QB models to A123 Systems ANR26650M1B Grade A and Grade B cells.
[Image: 271173_original.jpg]

The battery was bought from my reliable supplier (Queen Battery) 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 each battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 25±2°C. To be sure in results i've done each test minimum twice (usually 3-7 times).


Queen Battery QB26650 2300mAh

This cells looks like the 2500mAh, the only difference is the capacity mentioned on the heat shrink tube which tells us only the model, capacity and nominal voltage.
[Image: 270621_original.jpg]

Queen Battery QB26650 2300mAh has the following specifications according to its datasheet:
Typical capacity: 2300mAh (1C discharge)
Minimum capacity: 2300mAh (1C discharge)
Nominal voltage: 3.2V
Charge end voltage: 3.65V
Standard charge current: 2.3A (1C)
Charge cut-off current: 46mA (0.02C) (100mA used)
Cell's surface temperature during charging: 0-45°C
Discharge cut-off voltage: 2.0V
Cell's surface temperature during discharging: –20-60°C
Max continuous discharge current: 46A (20C)
Max short pulse discharge: 92A (40C)
AC impedance at 1KHz: ≤10mΩ at 50% SOC
Weight: 86g

Cycle life: аfter 1000 cycles at 2.3A charge/2.3A discharge (1C/1C) the capacity should be ≥1840mAh (80% of initial capacity).

DC IR at 2300mA in fully charged condition was 6.1±0.4mΩ (measured using EB Tester Software's Resistance test feature).

Measured dimensions: 26.7mm (diameter) × 65.2mm (length).

Measured weight: 85.80g.
[Image: 271804_original.jpg]

Queen Battery QB26650-2300 capacity test results (I've done each test 5 times).
[Image: 271054_original.png]
Just look at those numbers!!! This cell is rated at 2300mAh but it's real capacity is more than 2800mAh - 500mAh or 22% more than declared! I've never seen anything like this before... Even at 20A it doesn't go below 2700mAh! The curves look excellent! This guy stays above 3.0V most of the time! It's not just impressive, it's fantastic!

Here is the video version of this test including comparison to 2500mAh QB26650 and A123 Systems ANR26650M1B Grade A and Grade B cells:
[Image: 271524_original.jpg]

Verdict

Queen Battery QB26650 2300mAh should be marked as a 2800mAh one. It's a fantastic cell! It costs twice less than the 2500mAh model and 3 times less than ANR26650M1B. Queen Battery warns that these cells should not be connected in series of more than 4 cells and the total number of cells in the pack should not exceed 60 but i don't know the reason of such a warning. QB26650-2300's IR is very stable and there won't be problems with extreme disbalancing. Whatever, I'd highly recommend this cell as a very low-price LiFePO4 cell with excellent performance!

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.
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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