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Queen Battery QB10440 300mAh - a 3.7V AAA-size Li-ion battery

10440 size is more known as AAA - it means that the cell is 10mm in diameter and 44mm long. In Lithium world 10440 is a rare size but you can find 3.2V LiFePO4 and 3.7V Li-ion models just by googling "10440". To feel the difference let's take a look at 10440 (AAA) next to 14500 (AA) and 18650:
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test

This review's hero, Queen Battery QB10440, is a flat-top unprotected 300mAh-rated cell which also can be ordered with add-on protection PCB and button-top cap.
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test

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.

I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals
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 QB10440 300mAh


The cell's heat shrink tube shows brief specifications but has absolutely no data about production date or batch number.
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test

The main specifications from Queen Battery QB10440's datasheet:
Nominal capacity: 320mAh
Minimum capacity: 313mAh
Nominal voltage: 3.7V
Standard charge current: 150mA (0.5C)
Max charge current: 300mA (1C)
Charge end voltage: 4.20V
Max continuous discharge current: 600mA (2C)
Discharge cut-off voltage: 2.75V
AC impedance at 1KHz: ≤70mΩ
Weight: 9g

Measured DC IR at 300mA in fully charged condition was 63±10mΩ

Measured weight of the tested cell was 8.6g and the actual dimensions - 10.2×42.9mm
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test

Queen Battery QB10440 300mAh capacity test results:
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test
In case of QB10440 0.2C (for checking nominal capacity) is equal to 60mA and 0.02C (charge cut-off current) - 6mA. In both cases my battery tester allows 100mA as the minimum value which could be set, so instead of 6mA i cut the charge at 100mA and instead of 60mA test i did 100mA one. Even in those conditions QB10440's capacity was about 350mAh at 100mA discharge!!! I suggest that once it's charged using 6mA cut-off and discharged at 60mA it's capacity will be around 400mAh. At 300 and 600mA the curves look good. This guy handles 2C rate easily but i'd not recommend to go much higher than 600mA. This cell is not meant to power amp-hungry devices.

So, quick pros and cons:
+ more than 350mAh real capacity
+ up to 2C discharge rate
- 2.75V discharge cut-off current (harder to find a suitable protection PCB. Solution is to buy protected cells).

Here is the video version of this review:
Queen Battery QB10440 300mAh 3.7V AAA-size Li-ion battery's capacity test

Check out my YouTube channel for batteries, chargers and other stuff reviews.

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