1 No intelligence of the device stops charging after 4 hours. If the devices are not fully loaded too bad for you! He was nevertheless possible to electrically detect the end of charging devices for a better result. The latest smartphones do not charge all in 4 hours via USB. Future even less!
2 USB ports intensity is too low because a Samsung Galaxy SIII mini will not load at all on it. The Galaxy SII is responsible but does not seem to be either charged with the charger. It would nevertheless be possible to provide more than the standard 500 mA USB port knowing that here we are talking only to charge devices. The modern USB chargers offer 1A in general and on a single port!
3 It does not seem that this is the fault Belkin but the version distributed by Amazon is an English version. So cable sector and English instruction in English.
In conclusion this amounts to couple a programmable taken with a powered 4 port USB hub. This last solution to the merit of making configurable duration of the load of the machine.
In my case, I will try with USB Y cable so I can finally load the SIII and see what happens including a Kindle and an ASUS tablet.