One thing to note — both the Lii-500 Engineer and the new Lii-500S have a USB-out port, but have different functions.

On the Lii-500 Engineer, the USB-out port is a powerbank function (when power is disconnected, and there are li-ion batteries in the charger, it will be converted to “power-bank”.

On the Lii-500S, the USB-out port is a USB charger — it will only work when power is connected, and does not work as a powerbank.