Review: USB battery box 4x18650 Coolook PB-2000

EDC Gear for Flashlight Carriers USB Power Devices
21

I can check it:

106 gram

22

Thanks for the fast answer!

23

Is the power switch durable?

24

I am not going to test that

Usual these small switches does last a long time.

25

Thanks HKJ, great review as always :slight_smile:

26

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.

27

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.

28

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

29

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. :slight_smile:

30

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

31

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

32

Please make it!

33

Recoding A output to USB standard, i.e. not Apple:

Remove the four resistors wit a red cross and short the two points with the yellow line between.

34

Can I charge this from a wall outlet using an Apple ipad adapter?

35

I do not know anything about the ipad adapter and cannot tell you, maybe somebody else can?

36

Thank you!

37

I’ve been looking at this USB batter box , but can’t find any reviews.

38

Thank you for the excellent review!

Maybe you can answer a general charger/power pack question I have: My ZTE Engage smartphone is very picky about what will charge it. The two battery packs I have built already will charge the wife’s HTC One but not mine, my guess is because of something to do with the data pins. My power packs only use the + and - wires. So my question is about what certain chargers do to make the device it’s connected to think it’s connected to a computer, and how to know which chargers do that. Thanks!

39

Try checking the link in the "Notes" section of the review, at the bottom of that page is a table that might be useful.

40

This looks like a nice box, with different voltage outputs and display.