We have mounts of one form or another on all bikes and then there are mounts for rental bikes and rental cars and for wrists if your hands hold luggage . Velcro works very well. In fact it holds at times so well that it is hard to detach the phone. The velcro lets you sandwich battery between the phone and handlebar mount. Pouch for rain has its own velcro etc. I'll post later photos illustrating the general idea.