Queen Battery QB18650 2600mAh - balancing between price and performance

Queen Battery has two models in 18650 format and the first one is rated at 2600mAh. It's has a very attractive price per cell while providing continuous discharge at up to 13A.

Queen Battery QB18650 2600mAh battery Li-ion cell discharge 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 QB18650 2600mAh

The cell's heat shrink tube shows brief specs but has no data about production date or batch number. It's the new design which adds "2600mAh" mention next to the QB logo.

The main specifications from Queen Battery QB18650-2600's datasheet (pdf):
Nominal capacity: 2600mAh
Minimum capacity: 2550mAh
Nominal voltage: 3.7V
Standard charge current: 1.3A (0.5C)
Max charge current: 2.6A (1C)
Charge cut-off current: 26mA (0.01C) (used 100mA - the lowest allowed by EBC-A20)
Charge end voltage: 4.2V
Max continuous discharge current: 7A (0°C≤t<20°C) / 13A (20°C≤t<60°C)
Discharge cut-off voltage: 2.75V
AC impedance at 1KHz: ≤17mΩ

Measured initial DC IR at 2.6A in fully charged condition was 23.5±1mΩ

Measured weight of the tested cell was 45.96g

Queen Battery QB18650 2600mAh capacity test results:

Though the discharge cut-off voltage is slightly higher than usual - 2.75V vs 2.50V, this cell managed to show about 2700mAh at 0.2C test. At higher rates its capacity plays around 2500mAh and energy goes down to 7.9Wh at 13A discharge. Curves look excellent.

2600mAh is not a high capacity for a 18650 cell but taking into account its attractive price and 13A discharge rating it's a very interesting cell for building battery packs for ebikes, powerwalls, etc... For price inquiries drop an e-mail to wangxin570@gmail.com

Here is the video version of this review:

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

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