Who supplying a link to what?
I tried to imagine why also, could they mean physical damage if they are too long?
Here is the link to the site that claims electrical damage will result. This type of box was asked about here on BLF before
Looking forward to that! :-)
2xTP4056 chip for charging?
No, look at the charge curve. You can also look that the large version of the PCB photos (Click on the small photo) and see if you can find a TP4056.
Thanks HKJ.
And not a single one with micro-USB input… quite a shame, considering that most electronics are moving to microUSB nowadays (phones, tablets, mp3 players, etc)
These ones have a micro USB charging input:
http://www.ebay.com/itm/170922299583
I just got mine, and seems to work as expected.
Will do a review upon request.
Cheers!
Please
Review requested 
Added to my to-do list, cheers!
The one I tested has both round and mini usb input, but you are right, there is many different version of it.
All above box chargers are for 4 cells. May I suggest you HKJ to test something for 2 cells? For example this one:
http://www.fasttech.com/products/1421/10002784/1207400-enb-218650-li-ion-battery-usb-emergency-charger
+1
That looks pretty cool and a bit more pocketable.
I do already have one for two cells, but the one you linked to looks good, I have ordered it.
Now the question is if get time to do the reviews 
(Next item is a Soshine charge).
Oh wow, this could be best looking one of all 2-battery boxes I’ve seen to date. Going to order one for myself… because the 6x18650 box is just too big in some situations 
That’s only why I mentioned about it.
Thanks HKJ
I’ve already got 3 of these too, all three works fine, but cannot say anything about “2A”. etc… charging two devices at one time as expected - and this is main point
It seems that the 2 battery box from fasttech, has a to low low voltage protection. There is another thread about it, but i cant find it