The USB socket is mainly there for me to plug diagnostics kit into in the event of a problem. But you can also use it to charge gadgets using the power of your Bosch eBike battery.
You can use this cable to convert to female usb so then you can plug most gadgets into it and recharge on the fly -
http://www.e-bikeshop.co.uk/eBike-Spare-Parts/bosch-usb-converter
GBCS - would you like one added to the order you placed today through my website?
If so drop me an email or log into the account you created on my website and add it to your order.
Regards
Martin