Review: USB battery box 4x18650 Aili

USB battery box 4x18650 Aili



I found this box on ebay, specifications is something like:

  • Charging input: micro usb:5v/2A (charging 18650)
  • The total output current regulation: usb1+usb2=0.5A/1A/2A (3 speed adjustable)
  • Four power display level (25% red, 50% green, 75% green, 100% green)
  • Dual- Usb output , one can Recognition Ipad /iphone/ipod, the other is universal for other phone.
  • Reverse battery protection: if the battery is upside will automatically go into protection mode, corrected after a few minutes you can use .
  • Lithium battery the professional protection board , overcharge , over-discharge , over-current , short-circuit protection function , safe and reliable




How does it look



The box arrived in a envelope without any accessories.



The box exist in different color combinations, I got the pink version.



All connections are placed in the same end, micro usb for charging input and normal usb for output. These is also a led for flashlight usage.



On one side is a current limit switch, it can select between 0.5A, 1A and 2A, but it does not change the coding of the usb connectors and the overcurrent protection is not very good.
The black dot is a switch for the flashlight led.



On the other side, in a hole, is the switch to reconnect the batteries.



On the top of the box is the output switch with a red led in it and four green leds for power level indicators.
The red led behind the switch is on when output is on, the power level scale is on when the button is pressed.
When charging a red led, behind the power level scale will light up.



A closer look at the leds behind the power level indicators, as can be seen there are six leds.



To replace the batteries, slide the bottom off the box. The batteries can be up to about 67 mm, but shorter is better, this means that only unprotected cells will fit.



With a bit of violence it is possible to remove the top from the box.







Measurements

  • Disconnect load when current drops to 69 mA
  • When battery is disabled the current draw is about 20uA to 45uA depending on voltage.
  • When battery is enabled, but output disabled the current draw is 5mA (Will drain 3100mAh batteries in 3 to 4 months).
  • The USB outputs is coded as Apple 2.1A and USB charger only, i.e. if charging is slow or not working in one connector, try the other.
  • Battery state on leds: below 3.40 volt 0 leds, between 3.40 and 3.56 volt 1 led, between 3.56 and 3.73 volt 2 led, between 3.73 and 3.93 volt 3 led, above 3.93 volt 4 leds.
  • Led light uses up to 38mA, but will reduce current and brightness with falling battery voltage.
  • 0.5A/1A/2A switch does not change standby current or the coding of the outputs.
  • When charger is connected it will use input current to drive load and charge/discharge depending on load current.






I did two load sweep, one with the switch at 0.5A and one with the switch at 2A, as can be seen the current limit is changed, but the box does not turns off when overloaded, only reduces voltage.



With a 1.67A load the box can keep the voltage up for nearly 4 hours. At this load it stops discharging the batteries at about 3.1 volt.



Reducing the load to 0.5A, extends the runtime to more than 14 hours and the batteries are run down to just below 3 volt.



With 0.5A load and a single battery the runtime is about 3 hours and 45 minutes with a 3400mAh battery.






With 1.67A load the noise is about 129 mV



Reducing the load to 0.5A will reduce the noise to 35mV




The charge profile is a steady declining current, this makes the charging slow, but is acceptable.
The "termination" is at 450mA, this is way too high for a single battery, as can be seen the voltage drops about 0.08 volt when the charge terminates. The charge does not terminate fully, but will continue to charge with a small current until the battery voltage is close to 4.2 volt.







With four batteries it works better, here the voltage drop is less and the remaining charge current is much less due to higher voltage.
The charge time is slightly above 10 hours.



Conclusion

The box is acceptable, but there are a couple of details that could be better:
Due to the high standby draw, it is best to remove the batteries, when storing the box for more than a month.
The charging is acceptable when the box has four batteries in it, but has to high termination current for one or two batteries, i.e. they are not fully charged.
I do not really see the point in the current switch.




Notes

Read more about how I test USB power supplies and chargers

Thanks for this HKJ - another nice review. Seems like another “Close, but no cigar”.

Do you have a favourite USB battery box of the many you have tested to date? The 2 cell Fasttech one you reviewed here looks good to me.
edit - fixed link

My favorite are the ENB, followed by the Coolook.

Thanks again - I figured those two would be your favourites. A pity the Coolook doesn’t have a mini usb input (and besides, for the few times I really need one, a 2 cell box is good enough for me. Right, Fasttech here we come.

same with me. coolook maybe looks like a better deal, but it pretty big and charger with 4 batteries is something that I don’t really need. if there is a need for extra power, I can always take extra batteries with me for enb box, but when I don’t need it, I can’t shrink coolook box.
so, I ordered enb, day before yesterday. thanks hkj. :slight_smile:

“as can be seen the voltage drops about 0.8 volt when the charge terminates.”
Hmm I think you meant 0.08 volt here :stuck_out_tongue:

You have a point, I have fixed it. Thank you.

Thanks a lot for the review! Frontpage’d and Sticky’d.

I’ve been reading your reveies HJK. They are great. What do you consider the best USB battery box 18650. Thanks.

My favorite is the ENB, but there is also a couple of other very good boxes.

I was looking at this ENB, but I didn’t know if it was any good. Thanks.

http://www.fasttech.com/products/1381300

I saw that you also reviewed this one and I could not decide on which;

http://www.fasttech.com/products/1424/10004450/1340304

i like that both can charge in the unit without having to remove the batteries.

The Ruinovo is also very good, but it difficult to replace batteries in and I prefer a plastic box.

Thank you for your help.

What also nice about the Coolook , is it is a 4 bay balance charger

It’s funny, these are the very 2 I settled on awhile back. I like the Ruinovo 4x because it is very small and has the 2.1A output for an iPad. It’s true you would not want to take the batteries in and out, but I don’t need to.
On the other hand, the ENB 3x is good for that very same reason. It is very easy to replace the cells, in fact in a pinch I actually use it to charge cells. It is perfect for my FandyFire Warrior, as it runs on 3 cells.

So my advice, get both and be happy :bigsmile:

Cooling uses a metal rail to balance the four batteries, it is not a very impressive way to balance batteries.

Gentlemen (I assume), I’m sorry for asking the same question that Woody did. I could swear that they weren’t there when I read the review. Or it could be I’m getting old. In fact, I’m pretty sure It’s because I’m getting old. It is kind of amazing that we had the same question though.

HKJ, I wish you could review everything I buy.

Fasttech is out of stock of the 2 battery ENB but I found a couple of guys on Ebay that have them for only a few dollars more. I think I will use that one for my ‘’travel around’’ unit as the 3 battery unit is a little bulky, and like dchomak said, get the Ruinovo 401 as my home backup.

I don’t know if anyone here is vapeing, but I might try the ENB with this;

http://www.ebay.com/itm/251404274018?var=550326287573&ssPageName=STRK:MEWNX:IT&\_trksid=p3984.m1497.l2649.

PS, I also like this Ruinovo. It comes with it’s own backup light.

http://www.fasttech.com/products/1424/10004450/1340307

hi
i have this charger doctor
when i charge this box
it shows that amp goes down to 0 then resume again while charging
is this ok

thanks

It is not supposed to do that, maybe your power supply is to weak?

i tried with multiple oem chargers
like 12w apple or samsung 2amp
its the same
and i have more than one box they are all the same