Review: USB battery box 4x18650 Coolook PB-2000

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:
Iā€™ve actually ordered another for our camping trips.

Thanks for the great review!

Going to buy this from fasttech as theyā€™re providing a suitable ac adaptorā€¦ Problem is that Iā€™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?

6A is more than enough, but you might want the 10A to get a more solid adapter.

Sorry, what do you mean by more solid adapter? Is there a better one available somewhere I should be buying instead? Or did you mean that with the 10A it will work better?

Also, will panasonic 18650 protected batteries fit? The length is 69.4. I know you said 70 is the maximum length, just double checking :stuck_out_tongue:

Thanks alot!

I would expect the 10A adapter to have a slightly better construction, because it must be able to sustain higher current.

I do not know of better adapters, but there probably is.

Yes it will, but probably a tight fit (Sorry, I am not near the box at the moment).

Alright, purchased. Thanks for the help :slight_smile:

A shame it doesnā€™t have digital readout, like some of the boxes out there.

[/quote]

Check that plug charger is dangerous.

http://www.lygte-info.dk/info/usbPowerSupplyTest%20UK.html

Check that plug charger is dangerous.

http://www.lygte-info.dk/info/usbPowerSupplyTest%20UK.html
[/quote]

Which one do you refer to in HKJ site?

I strongly recommend to get this USB power adpater

My niece bought one lookalike as JIB LB20000, she told me she just able to fully charge her iPhone 4 about 3-4times.

I pry open which also in turn, broken all the plastic hinges, the PCB charging current is +ā€“800mA measured.

Inside consists of eight 1100mA noname blue wrapper 18650 batteries, which takes 11 hrs to fully charge the unit.

While I do not own the JIB version, maybe it uses different battery.

Sheā€™s very happy that I gave her one of my portable power supply, consists of two Sanyo Red 2600mA and a 4 ports USB wall adapter, in terms of compactness, hours to charge the portable power supply & able to charge her iPhone 4 about 2.3times.

Check that plug charger is dangerous.

http://www.lygte-info.dk/info/usbPowerSupplyTest%20UK.html
[/quote]

Thanks for pointing that out to me, but it looks like it is the 240 volt version, whereas I got the USA version with the 2 flat blades and I donā€™t see that model in the review, with that said though I havenā€™t even used the usb plug-in charger it came with, rather I used the Samsung charger that came with my phone. The battery power box itself seems very well built and arrived 3/4 charged already, took no time with the Samsung usb charger to top it off.

Again thanks for the heads up, to be safe Iā€™ll probably not use the included usb charger even though itā€™s a different model than reviewed.

So the specifications saying ā€œCharging input: DC 5V, 0.5A~2.5A.ā€ is wrong? And you canā€™t use a normal USB charger but need a custom DC power supply?

Why? Itā€™s surely fake and not the adapter tested in the charger tests mentioned earlier?

One detail I do not check, is how the charge circuit handles lower input voltage. If it reduces the charge current, it will probably work with most chargers.

You can get USB chargers that are powerful enough to handle this box at full charge current or you can take the batteries out and charge them in a normal LiIon charger.

Can you recommend any 2.5/3A USB chargers that are USB charger coded and not that dodgy?

Probably not.

USB charger is only rated up to about 1.5A. This does not prevent it from delivering more current, but manufacturers may chose to label it as Apple 2A.

USB chargers with multiple outputs are usual the best, they often run all the outputs in parallel, i.e. a charger with 4 0.5A output, will have a total of 2A, that can be drawn from any port, as long as the other ports are unused..

Yes, I ment multi-output chargers. There are some rated for 3A/15W or so but probably of questionable quality (and says for iPad etc)ā€¦ I know there is a model from Pisen with 2A+1A ā€œfor Samsungā€ but only for Chinese market and I havenā€™t seen it for sale anywhere.

I could always use one of the 5V 4A power supplies I have, but they are not so small and canā€™t be used for anything else. If I bring an 18650-box on travels I want to be able to use the same USB chargers as for me and my gfā€™s phones and tablets (1A-2A, no Apple products).

mfm, was it this Pisen charger, with separate 1A and 2A USB sockets?

Yes. However, Iā€™m only marginally interested and I wonā€™t buy any more Pisen products until they replace my broken power bank.

(Also I imagine it would be a headache to order from tmall.com, even though the Chinese language and delivery to a Chinese address would not be a problem in itself).