LogiLink PA0062 USB Charger 4-Port, DC 2500mA (Accessories)
Actually, the unit is completely ok, but the maximum load is 2A, 2.5A not! In 2.4A load the output voltage drops slowly and after 50 minutes at less than 4.7V. This is too little, showing that the device is overloaded. When the voltage at 5.1V 2.1A r