Test/Review of Blitzwolf QC3 power bank 5200mAh BW-P4

EDC Gear for Flashlight Carriers USB Power Devices
1

USB battery box Blitzwolf QC3 power bank 5200mAh BW-P4







The box has two 2600mAh 18650 cells and with one usb output that can do quick charge.

The specifications are:

  • Brand: BlitzWolf®

  • Model: BW-P4

  • Capacity: 5200mAh/19.24Wh

  • Power: 18W

  • Battery Type: 3.7V 2600mAh 18650 Battery Cell *2

  • Input: 5V/2A (max)

  • Output:: 3.6-6.5V/3A,6.5-9V/2A,9-12V/1.5A (QC3.0)

  • Charging time: About 3.5 hours (with 5V/2A Charger)

  • Size: 108.15*46.20*21.30mm

  • Weight: 156.3g (not include package)

  • Certification: CE,FCC,RoSH,Qualcomm Quick Charge 3.0


I got this battery box from Banggood.



How does it look



The power bank is delivered in a brown cardboard box.



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



Connectors and switch is placed at one end:

  • On and status button.

  • Micro usb for charge input.

  • A usb output that can do quick charge v3.0.





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



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





Measurements

  • One or more of the led in the strip is light when output is on.

  • Outputs is coded as USB charger DCP and support Quick Charge 2.0 & 3.0

  • Lowest voltage for QC3 is 4.53V (This is a bit high).

  • Output will turn on when loaded, only a very weak load is needed to turn the output on.

  • Output will turn off when load is below 65mA for 30 seconds.

  • When charging the leds shows charge state.

  • A short press on the button will turn on output and show the charge state.

  • Output turns off when input power is connected.

  • Weight: 156.3g without accessories.

  • Size: 108 x 46 x 21.2mm





The output is rated for 3A and can deliver 3.2A before it starts dropping, overload kicks in at 3.5A, this looks good.



QC at 9V is rated for 2A and can deliver 2.2A before it starts dropping.



QC at 12V is rated for 1.5 and can deliver 1.7A.



The power bank can deliver 0.5A for about 6½ hour.



At 1A the runtime is down to 3 hours and some minutes.



At 2A it is 1 hour and 15 minutes and the output is stable until the power bank is empty.



Quick charge at 9V and 0.9A can be delivered for nearly 2 hours.



Drawing 1.2A at 12V works for about 1 hour, then the output drops to 5 volt.



The noise is 18mV rms and 95mVpp



The noise is 22mV rms and 110mVpp



The noise is 45mV rms and 190mVpp



The noise is 66mV rms and 278mVpp



The noise is 111mV rms and 366mVpp




The input current is a bit abouve the rated 2A, at the peak it is nearly 2.3A. This means less than 2½ hour for charging.



Using a charge 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 more than 6 hours to charge.



Conclusion

The power bank can deliver rated current, has fairly low noise and has quick charge, I would have liked higher capacity batteries and less voltage sensitivity when charging.

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
2

Nice review, but aren't they all :)
Nice to see we have reached the same conclusion too.
Will you be testing the 15600mAh version too?

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Yes.

4

Thanks! It is strange that Blitzwolf decided to use lower capacity batteries for the new models and even downgraded the ones used in the BW-P3 (used to be 10000 mAh).

But then again, they have the new usb-c model BW-PF1 with 3350 mAh batteries.

5

I've got that one on the way, although I still have no idea how I'm going to test it :)

6

I have a general question about the 5 volt output of chargers/power banks. I see that you have a yellow line for the high and low voltage (5.25v-4.75v).

I have a couple of phone chargers that are a bit over 5 volts. One of the chargers I have measured at 5.7 volts while charging my phone. I stopped using it, and went to a charger that outputs 5.1 volts. I used an Xtar VI01 to measure the voltage. A short charge time is not important to me.

The question is, will 5.7 volts hurt my phone? Apology if this question has been asked before.

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5.7v is out of spec for normal USB, 5.25v is the standard max.

I’m also surprised if this is a newish powerbank, it’s like the Anker Astro, lacking capacity of its competitors. The Ravpower version (2x18650 size) is 6700mAh and very good value and saying that the Xiaomi 10,000mAh isn’t far off in price and much better capacity.

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It may, but most equipment is fairly tolerant of a small over voltage.
If the phone supports Quick Charge v3.0 then 5.7 volt is a legal voltage.

9

Good news. 30% off via Amazon on the larger 15600mah power bank if you request a code via email. I just requested a code when I read it. Non affiliate link

Please see BlitzWolf Electronics Store - Smart Home, Audio, Projector

Good review HKJ. I need a good power bank.

10

Hi, do you know how the no load on output automatic turnoff circuit works, have you taken one of these apart. I have the ts80 soldering iron & bw-pf2 which gets switched off after 30 seconds or so because it heats up then uses only a small amount of current until it heats the tip again. I was thinking if it’s just some sort of capacitor timer you could increase the time by changing components, or if it’s a microcontroller I’m guessing there’s no fix, if for instance it could be kept on for 2 minutes, that would be perfect, I couldn’t find a teardown of a blitzwolf powerbank anywhere, any ideas/experience.

Cheers