The second USB charger unfortunately held by only about eight weeks. Now it is broken and unfortunately does not charge more .... well go the integrated LEDs no longer. This part goes back to Amazon and will be replaced by a new device. Let's hope this lasts longer.
The charging capacity of 4000mA I can not quite understand, unfortunately. Possibly lies but also on the mobile phone used. A Galaxy S2 discharges with current navigation unfortunately despite alleged 4000mA. Even if it was only half per port .... If that does not quite.