USB battery box Blitzwolf QC3 power bank 15600mAh BW-P5

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The box has six 2600mAh 18650 cells and with two usb output, one can do quick charge.
The specifications are:
I got this battery box from Banggood.



How does it look

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The power bank is delivered in brown cardboard box.

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It contains the power bank, a usb cable and a instruction sheet.

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Connectors and switch is placed at one end:

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Leds for charge status is placed on the top of the power bank beneath some small holes.

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On the back of the box is the specifications and approval marks.

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Measurements


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The normal usb output is rated for 2.4A and can deliver 2.7A before it shuts down, this looks good.

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The QC output is rated for 3A, but the current limit is above 4A, this is rather high for usb connectors.

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At 9V the output is rated for 2A and can deliver 2.6A, before it drops to 5V

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On 12V it is rated for 1.5A and can deliver 1.8A before it drops to 5V.

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The normal usb output has a lower voltage when the power banks is being charged.

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On the QC output the boost converter will keep the output voltage up to the selected QC voltage.

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The power bank can deliver 0.5A for about 22 hours on the normal usb output. This is about 55Wh and matches fine with the rated 57.7Wh.

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And the same on the QC output, i.e. the converters has about the same efficiency.

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At 1A load the time is down to 10 hours.

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And at 2.5A load the time is nearly 4 hours.

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Drawing 0.9A at 9V is about 6 hour.

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Drawing 1.2A at 12V is about 3 hour.
All outputs maintain voltage nicely until the power bank is empty at these loads.

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Loading both normal usb and quick charge usb output at the same time with 1.5A, i.e. a total of 25 watt did not work for long.
It could only maintain the output for a bit over a minute before it shut down.

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Reducing the load top 1A (total 17 watt) works much better, here I could maintain the output for about 3 hours.
I.e. the power bank cannot charge two power hungry smart phones at once, but anything a bit more moderate will work.

10ohm

The noise is 11mV rms and 358mVpp, at this low load there is a little bit of noise.

5ohm

The noise is 9mV rms and 100mVpp

2ohm

The noise is 17mV rms and 99mVpp

10ohmQC5V

The noise is 10mV rms and 88mVpp

2ohmQC5V

The noise is 38mV rms and 241mVpp

10ohmQC9V

The noise is 52mV rms and 260mVpp

10ohmQC12V

The noise is 108mV rms and 565mVpp, boosting the voltage increases the noise.

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The power bank is specified to use 2A while charging and the current draw is close to that, this means 8 hours charge time. It looks like it uses a nice CC/CV charge algorithm.

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Using a charger with less current, low output voltage or a long charge lead requires a lot of patience because the charger turns the current way down. With 0.5ohm in series with the 5V power supply it took 40 hours to charge.



Conclusion

The power bank have two high power outputs, one with quick charge, it can charge one high power device or two moderate devices at a time. Noise levels are low in most situations.
With 15600mAh is has a lot of energy, but with more modern batteries it could have contained more energy without being any heavier.

I will call it a good power bank.



Notes

The power bank was supplied by Banggood for review.

Read more about how I test USB power supplies and chargers