Review: USB battery box 4x18650 Coolook PB-2000

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:

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

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

Please make it!

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.

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

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

Thank you!

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

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!

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

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

Hi HKJ, got some question about the USB power adapter that come with this box(purchased from fasttech)

What kind of coding does this one use?

I figured that they are 6.2 kΩ on both D+ and D- pulldown, 5.6 kΩ on D+ pullup and 10 kΩ on D- pullup.

Edit : Just cut some crappy USB cable and check it with DMM and yes, it’s Apple 2.1A coding. :slight_smile:

The best match is Apple 1A, but the voltages are slightly high for that. I do not know if a Apple product will accept it.

Sorry for late update, just cut some cable and check with DMM and the voltage match the Apple 1A coding (got 2.001V on D+ and 2.702 on D-)

Edit : I was wrong, it’s 1A as HKJ said

Thank you for these great reviews HKJ. It really helps to get an idea of what these products are so we don’t have to order blindly.

I have a question about using cells of different voltages in this or other boxes. Why is this not a good idea? Shouldn’t they balance each other out since they are in parallel?

Also, would using different types/rands of batteries within the same box be OK? (eg Sanyo UR18650FM and Panasonic NCR18650B)

And lastly, Any chance that you could review this USB battery box?
QIDIAN 3-Piece 3A 1-4*18650 Dual USB Output Mobile Power Pack Battery Charger Kit

https://www.fasttech.com/products/1420/10004461/1341401

Thanks a lot.

They will balance each other out, usual in a couple of minutes. To avoid this high cross current, it is better to start with about the same voltage on the batteries.

It is the same when charging in parallel, it is recommended that the batteries are close in voltage, before you start.

It will work, but you might not get the full advantage more batteries. With four of the same, they will always share the load. If you mix UR18650FM and NCR18650B, the UR18650FM will have the main load at the start and the NCR18650B will have the high load at the end.

Yes, there is a very good possibility. I have it in queue (That means that I have), but that queue is rather long at the moment, i.e. it will probably be more than a month, before I post a review.

I bought just bought this one myself JIB LB20000

Just to let everyone know , mine came from fasttech and it happily charges my iPad and iPhone -:slight_smile:
I’ve actually ordered another for our camping trips.

Thanks for the great review!

Going to buy this from fasttech as they’re providing a suitable ac adaptor… Problem is that I’m in Australia so I need a converter from here: http://www.fasttech.com/products/1183109

Should I get the 6A or the 10A one?