Hi, i am looking to add USB port to my Haibike Yamaha hardseven SL. I found on ebay a sub unit Handlebar USB Power Charger Adapter 36V 48V 60V 72V 84V to 5V 2A for Ebike . I added it directly to battery wires and all works fine. If power of bike is off, the phone charges at 300mAmper, if i switch power of my bike on, the phone shows charge 700mAmper. This is very well for me, but i would like to know is it fine for my bike? Thanks and sorry for my english.