Anet A8 Power Cover with USB-Power

I have made a power cover for my Anet A8 with a attachment for a USB powerconverter for my BananaPi.
http://www.ebay.de/itm/DC-DC-9V-12V-24V-to-5V-USB-Step-Down-Step-up-Power-Supply-Module-D-/371386554328?var=&hash=item0