Bike Stem Battery Pack Holder

thingiverse

I started using my cell phone as a bike computer, so I needed to figure out how to keep it charged on the move without cluttering up my bike with a top tube bag. To get around this problem, I use velcro strips to attach and detach a small pack that holds my battery charger, making it easy for me to swap in a fresh one whenever I need to. Additionally, I employ zip ties to secure the pack to the stem of my bike, allowing for quick removal if necessary. The design is streamlined enough that I've been able to ride without the velcro or zip ties in place. My stem measures 35mm in diameter. To keep my phone powered up on long rides, I rely on a Anker PowerCore 5000 battery pack, which I purchase online from their website.