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Queen Battery QB18500 1600mAh - shorter than 18650
#1
Video 
18500 cells share the same 18mm diameter with 18650 cells but are 15mm shorter - their length is 50mm vs 65mm in case of 18650.
[Image: 253290_original.jpg]

QB18500 is a 1600mAh low-drain cell which supports continuous discharge at 1.6A max.
[Image: 253571_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 23.0-24.5°C. To be sure in results i've done each test minimum twice (usually 3-4 times).


Queen Battery QB18500 1600mAh

The cell's heat shrink tube shows brief specs but has no data about production date or batch number.
[Image: 252825_original.jpg]

The main specifications from Queen Battery QB18500's datasheet:
Nominal capacity: 1600mAh
Nominal voltage: 3.7V
Standard charge current: 320mA (0.2C)
Max charge current: 800mA (0.5C)
Charge end voltage: 4.20V
Max continuous discharge current: 1.6A (1C)
Discharge cut-off voltage: 2.75V
AC impedance at 1KHz: ≤80mΩ
Weight: 32±1g

Measured initial DC IR at 1.6A in fully charged condition was 51±4mΩ

Measured weight of the tested cell was 33.7g
[Image: 254015_original.jpg]

Queen Battery QB18500 1600mAh capacity test results:
[Image: 253094_original.png]
At 0.2C or 0.32A QB18500's capacity was noticeably higher than the 1600mAh declared. Even at it's maximum allowed 1.6A it remained above 1600mAh which is a pretty good surprise. All three curves look beautiful, without any sags or peaks.

Though QB18500's results are excellent, there is a serious disadvantage which can't be ignored - the standard charge current. It's only 0.2C which means that you gonna charge it for long 5 hours. Of course nobody bans you from charging it at up to 0.5C but even that maximum allowed 0.5C looks too low for nowadays. For some people 2.75V discharge cut-off would also be a disadvantage but i think the most packs where 18500s are used the BMS cuts off at 3.0V.

Here is the video version of this review including size comparison:
[Image: 253764_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 likes 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
Reply
#2
Very good find, thanks. If you do get the change, do a test also on the Panasonic 2000mAh ones.

I could really use some 18500s to upgrade my blue lasers but they are very hard to find on my local market.
Reply
#3
Which is why the internet exists:[/url]
[url=http://s.click.aliexpress.com/e/0br387O]https://www.aliexpress.com/item/32564576218.html
The power of lithium ion is in our hands!
We'll show them what we're made of!
Reply
#4
(06-13-2019, 12:38 PM)Overmind Wrote: do a test also on the Panasonic 2000mAh ones.

Some 3-4 months ago I got Panasonic NCR18500A (made in China) and Sanyo UR18500FK. Gonna test them too.
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


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