Queen Battery QB18650 3000mAh - real high capacity at low price

This is Queen Battery's second model in 18650 size and it's rated at 3000mAh. It's a low-drain (6.4A) cell with modest price tag so it could be ideal for using in battery packs.

Queen Battery QB18650 3000mAh 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 3000mAh

The cell's heat shrink tube shows brief specs but has no data about production date or batch number. It shows "3000mAh" mention next to the QB logo.

The main specifications from Queen Battery QB18650-3000's datasheet:
Typical capacity: 3200mAh
Minimum capacity: 3000mAh
Nominal voltage: 3.7V
Standard charge current: 1.6A (0.5C)
Max charge current: 3.2A (1C)
Charge end voltage: 4.20V
Max continuous discharge current: 6.4A (2C)
Discharge cut-off voltage: 2.5V
AC impedance at 1KHz: ≤40mΩ
Weight: 47g

Measured initial DC IR at 3.2A in fully charged condition was 33.1±1mΩ

Measured weight of the tested cell was 46.15g

Queen Battery QB18650 3000mAh capacity test results:

The second 18650 cell from Queen Battery is designed to be discharged down to 2.5V not 2.75V like the 2600mAh one. At 0.2C capacity is slightly higher than 3000mAh. At 6.4A which is declared as its maximum discharge rate its capacity remains close to 2900mAh and the curve doesn't seem to have any signs of being close to the edge. I think the cell can handle higher discharge rates but i would not recommend to go over 5A in order to keep the cycle life in reasonable range.

High capacity and low price are the pros of QB18650-3000 but bear in mind that it's not a high drain cell. For applications like e-cigs or power tools it's not a good choice, but in a large battery pack with many cells in parallel groups it would be just in place.

Here is the video version of this review:

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

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