Review: USB battery box 4x18650 Coolook PB-2000

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HKJ
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Review: USB battery box 4x18650 Coolook PB-2000

USB battery box 4x18650 Coolook PB-2000

DSC_1926

This battery box is called Coolook iPower and has the type number PB-2000, it can be found on ebay from a couple of dealers (They do not always include the brand name or type number).
The specifications is something like:

  • Battery replaceable.
  • Intelligent charging with indicator to show the charging status.
  • Output current-limiting protection to avoid damage when over load.
  • Can charge most cell phones as well as iPhone and other Apple products.
  • Easy to open and close the charger box, just need press to one side,and don't need any screw.
  • Size: 12cm x 8.5cm x 2.3cm - 4.72inch x 3.35inch x 0.91inch.
  • Charging input: DC 5V, 0.5A~2.5A.
  • Output: DC 5V 2.0A.
  • Material: Plastic.
  • Batteries: 1 to 4pcs of 18650 lithium batteries(not included).



How does it look

DSC_1918 DSC_1921 DSC_1920

DSC_1919

This usb box was supplied in a branded box, with specifications on the outside.
The QR code contains the specifications (Same as printed on box), there is no link in it.

DSC_1922

The box only contains the usb box and a cable for charging the box, there is no instruction manual.

DSC_1923

The specifications are also printed on the usb box. Because this includes input and output current and charge voltage, I believe it is a good idea.

DSC_1925

All connections are in one end of the box, there are two usb outputs and one charge input.
As usual the usb outputs are in parallel, i.e. the 2A can be drawn from one output or 1A from each.
I would have prefered the charge input had been a micro usb connector, with this DC connector I always needs to carry the special charge cable for the box.

DSC_1940 DSC_1959

The control panel on this box is very discrete with only a on/off button visible, but hidden under the black surface is 5 leds, that are used to show on state and power level.
When off the button must be held down for some time, before the box turns on.
When on a short press will show battery status and a long press will turn the box off.
Battery status corresponds to these voltages:

  • 5 leds: min 3.98 volt
  • 4 leds: min 3.85 volt
  • 3 leds: min 3.77 volt
  • 2 leds: min 3.66 volt
  • 1 leds: always


When charging the leds will be on and showing the charge state, when using the output the leds will turn off after a short time and only the center led will slowly flash.

DSC_1927 DSC_1929

Slide the cover slightly and it can be removed. The box has space for four 18650 batteries and can use batteries up to 70 mm long. The box can work with both protected and unprotected batteries. But as can be seen from my measurements, there is no reason to use protected batteries in this box.
When using multiple batteries, remember that they must have the same voltage when put into the box, easiest way to do this is to charge all batteries first.

DSC_1935b

Inside the box there is also a reconnect battery switch, that must be used when replacing batteries.
Trying to charge the batteries will also do a reconnect.

DSC_1937

The design of this box is slightly different from the other ones I have tested. Here the battery connection rails are directly connected to the PCB, there is no wire. This gives a better connection.
The PCB does also have many small holes (via's) where the rails are connected, this is done to improve the strength of the connection and is a good design.


DSC_1938 DSC_1939

The electronic does also looks robust, there is four chips in parallel, handling the power and on the other side of the PCB there is a large transistor.
The microprocessor is branded "coolook", this does not mean that it is a special processor, only that "coolook" ordered enough to get their own name on it.
It is possible to click on the PCB pictures for a large version.

DSC_1943

Here is a closer look on the box, where the led and button are placed.

DSC_1944 DSC_1946

As usual I had to add a resistor to measure the current.



Measurements

  • Overload limit turns the box off at 2.4A
  • The box will disconnect the batteries when the voltage is 3 volt.
  • Turns off with load below 65mA after 20 seconds
  • In battery disconnected state the box uses about 21uA from the battery.
  • With battery connected but output disabled the box uses about 0.6mA (This is more than 2 years with a full load of 3100mAh batteries).
  • When a charger is connected, the output will be off.
  • Output A uses Apple 2.1A coding.
  • Output B is not coded.



USB%20Battery%20box%20load%20sweep

A load sweep, the output turns off at 2.4A. Below that it has a very nice output.

USB%20Battery%20box%20%233%20USB%20out%202.1%20ohm%20(4xPA18650-31)

The sweep showed stable output up to 2.4A, let’s try loading it for some time with 2.38A.
That did not work, it could only keep stable output for 7½ minutes. It is not that surprising, the box is only rated for 2A.

USB%20Battery%20box%20%233%20USB%20out%202.5%20ohm%20(4xPA18650-31)

Reducing the load to 2A works much better, here the output voltage is perfectly stable for more than 3 hours and the efficiency is close to 90% (This is very good).

USB%20Battery%20box%20%233%20USB%20out%2010%20ohm%20(4xPA18650-31)

With 0.5A load the output is stable for nearly 15 hours and the efficiency is above 90%.

USB%20Battery%20box%20%233%20USB%20out%2010%20ohm%20(PA18650-34)

A single 3400mAh battery.

USB%20Battery%20box%20%233%20USB%20out%2010%20ohm%20(PA18650-31)

A single 3100mAh battery.

USB%20Battery%20box%20%233%20USB%20out%2010%20ohm%20(BE18650-26)

A single 2600mAh battery.

2.5ohm

When running with 2 ampere there some noise in the output (About 70 mV rms).

10ohm

Reducing the current to 0.5A, will also eliminate most of the noise (About 20 mV rms).

AutoPowerDown

The box will turn off automatically if the load is removed. This might make it turn off with some equipment connected (Like when a phone is fully charged).

USB%20Battery%20box%20%233%20charge%20(4xPA18650-31)

Charging four 3100mAh batteries takes about 9 hours and requires a charger that can deliver more than 2A.
The charger will use a lower charging current, until the battery reaches about 3.6 volt.
The charging does not follow a CC/CV curve, but the only negative aspect of this is a longer charge time.

USB%20Battery%20box%20%233%20charge%20(PA18650-34)

USB%20Battery%20box%20%233%20charge%20(PA18650-31)

USB%20Battery%20box%20%233%20charge%20(BE18650-26)

It takes slightly longer to charge the 2600mAh battery, compared to the 3100mAh battery. This is because the battery has higher voltage and the usb box then uses a lower charger current.



Conclusion

This box has a very good electronic and can supply the rated current without drowning everything in noise.
With the exception of the charge connector, I really like this box and did not find any problems.

When I was finished with the review I changed the coding on output B to usb charger, this is very easy to do.



Notes

Read more about how I test USB power supplies and chargers

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Edited by: sb56637 on 06/25/2015 - 11:41
GottaZoom
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Thanks for the review!

relic38
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Great review, looks like a good battery box charger. I got something similar for Fasttech, but this Coolook one looks to be better quality.

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Don
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Just ordered one.

Thanks for all your work HKJ.

It really is useful.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

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That is a really nice review indeed, HJK ! :hat:

HKJ
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relic38 wrote:
Great review, looks like a good battery box charger. I got something similar for Fasttech, but this Coolook one looks to be better quality.

This is the best of the first 3 usb boxes I have tested. Number 4 does also have a very nice output, but has some other problems (More about that next week).

There exist a lot of these 4 cell usb boxes and their performance varies. Often you can find a photo of the circuit board, you can then compare that to the ones I have tested and see if there is a match.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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Thanks for a great review. I really appreciate all the work that goes into these.


 

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Thanks very much for the review! Sticky’d.

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Thanks for the review!!! From which seller did you get it?

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HKJ
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laszlomdq wrote:
Thanks for the review!!! From which seller did you get it?

 

I got it from here: http://www.ebay.co.uk/itm/190720529779

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

picrthis
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Just noticed the sellers listing say no retail box, just put in plastic bubble wrap??

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watkins
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Ordered, and 4 panasonic 3100 from fasttech to go in it and not lose any batteries from the torch line up.

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picrthis wrote:
Just noticed the sellers listing say no retail box, just put in plastic bubble wrap??

It does and I was very surprised when I got it in a retail box.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:

picrthis wrote:
Just noticed the sellers listing say no retail box, just put in plastic bubble wrap??

It does and I was very surprised when I got it in a retail box.

Maybe BIC knows you and sent a better sample? Wink

Ps. Ordered.

=the=

 

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Will it work with flat top cells (laptop pulls)?

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_the_ wrote:
Maybe BIC knows you and sent a better sample? ;)

I doubt anybody selling these boxes could suspect I would review them, even if they did know me.

 

thebiggboss78 wrote:
Will it work with flat top cells (laptop pulls)?

Yes.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

laszlomdq
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HKJ wrote:

laszlomdq wrote:
Thanks for the review!!! From which seller did you get it?

 

I got it from here: http://www.ebay.co.uk/itm/190720529779

Thank you very much, I’ll give them a try.

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Ordered.

Smile

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poletani
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Thanks for the review, HKJ!
Just one question: do you know how much does it weigh itself, without any cable, just the empty box?

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poletani wrote:
Just one question: do you know how much does it weigh itself, without any cable, just the empty box?

I can check it:

106 gram

 

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

poletani
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HKJ wrote:

I can check it:

106 gram

 

Thanks for the fast answer!

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Is the power switch durable?

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alex21 wrote:
Is the power switch durable?

I am not going to test that Smile

Usual these small switches does last a long time.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

alex21
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HKJ wrote:

alex21 wrote:
Is the power switch durable?

I am not going to test that Smile

Usual these small switches does last a long time.

Thanks HKJ, great review as always Smile

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Hi to everyone, this is my first post. A totally newbie.

And thanks to HJK for this fantastic review, looks awesome but still don’t understand some of these statistics :~ , I had to learn more :bigsmile:

I’ve some question about this battery box. I’ve the same (but white color), and bought on ebay. When receive mine, I had a problem with B USB output.

The B USB can’t charge Apple devices, and as HJK comments, the problem seems that is not Apple coded. Explained to the seller the problem and he sends me another unit with the same problem |( . The seller is asking the problem to the factory and he told me that they don’t know what’s the matter, really?

But maybe is not a problem of the unit, and the unit only can charge Apple devices in A port and should recode B port to charge Apple devices at the same time.

HJK, it’s possible to recode B port? Now I have two battery box that I can’t use B port.

Thanks.

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Litil wrote:
HJK, it's possible to recode B port? Now I have two battery box that I can't use B port. Thanks.

You can use port B for non-Apple devices.

If you can solder it is probably possible to recode port B.

First you must secure that there is no resistor on port B (Some devices does have that).

Then you must solder two thin wires from port A to port B (Note: I do not have any Apple devices and cannot test it).

If there is any interest I can make a illustration on the pcb photo.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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Fasttech now have this Coolook in stock, with various combinations of battery.

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I ordered but never received tha box from ebay. At least they refunded me.

Glad to hear that fasttech has it. Lately I’m buying exclusively from Fasttech. Nobody else compares. Smile

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_the_ wrote:

HKJ wrote:

picrthis wrote:
Just noticed the sellers listing say no retail box, just put in plastic bubble wrap??

It does and I was very surprised when I got it in a retail box.

Maybe BIC knows you and sent a better sample? Wink

Ps. Ordered.

I almost forgot, but yes: I received one without the retail box. (Which is good, I guess. I can still make undercover reviews ;))

=the=

 

alex21
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Is that a 5V 2A adaptor? How long to charge 4 * 3400mah cells? thx

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