Blitzwolf QC3 power bank 10000mAh BW-P3

Blitzwolf has made an update version of this power bank

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The Blitzwolf brand covers many different products, this time it is a power bank I am looking at.
The specifications are:
I got it from Banggood



How does it look

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The power bank is delivered in the usual Blitzwolf brown cardboard box.

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

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Both input and both output usb connector is placed at one end. The micro is for charging the power bank and the two USB-A for charging other devices from the power bank. The one with the circle and lightning symbol is the quick charge port.
The button is for showing capacity and turning the output on, usual it will turn on automatic.

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The other end has some specifications.

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On top is the four charge status led behind some small holes.

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The bottom has a note about QC3.




Measurements


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This load sweep stopped premature, not because I reached the maximum current, but because it times out.

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I did succed in drawing 0.5A for 6 minutes.

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The QC output do not have these problems, it can deliver more than 4A.

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At 9V it can deliver a bit above 2A, before the voltage starts dropping. At 3A it changes to 5V

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At 12V it can deliver about 1.7A before starting to drop and it will change to 5V at 2A.

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The QC output can deliver about 6600mAh output at 0.5A, this is very good for a 10000mAh battery capacity.

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At 1A the output is the same.

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For the 12V output I uses a 1.5A constant current load. As can be seen there is some problems maintaining the output voltage when the batteries are low.
I measured about 28.7Wh out of the 36Wh on the battery pack, this is fairly good.

10ohm

At 0.5A the noise is 3mV rms and 38mVpp.

5ohm

At 1A the noise is 1.6mV rms and 32mVpp.

2.5ohm

At 2A the noise is 7mV rms and 56mVpp, these values are very good.

10ohmQC5V

At 0.5A the noise is 4mV rms and 46mVpp.

2.5ohmQC5V

At 2A the noise is 14mV rms and 117mVpp.

10ohmQC9V

At 0.6A the noise is 26mV rms and 158mVpp.

10ohmQC12V

At 1.2A the noise is 53mV rms and 300mVpp.

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The charge circuit uses a buck converter and it looks like it is doing CC/CV charge. A full charge takes about 6 hours on a 2A charger.

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Add a 0.5ohm resistor in series with the charger to simulate a long cable or weak charger slowed the charging down. Very much down in fact, the charging took 20 hours.
In my opinion this power bank is way too sensitive about voltage when it is charging.



Conclusion

This power bank had a fault with the usb output, preventing me from testing it fully.
The QuickCharge output worked fine, with fairly low noise and the expected capacity.
Both outputs was slightly below 5V, I would have preferred slightly above 5V (In many situations this works better).
I am not very impressed with the charging input, it is way too critical with input voltage, use the wrong cable or charger (One with slightly low output voltage) and the charging may take 20 hours instead of 6 hours.
I would have like a better marking of the ports, like an orange usb for QC or just QC printed beside it.

As a power bank it works fairly well, but I will only rate it acceptable for now.



Notes

The power bank was supplied by Banggood for review.
I got two copies of it, the first one could not keep the normal usb output on and the second one had the same problem.

Read more about how I test USB power supplies and chargers