Bike Stem Battery Pack Holder
thingiverse
I started using my cell phone as my bike computer so I needed a way to keep it charged on the go, but didn't want to use a top tube bag. I use velcro to hold the pack in so that I can swap it out and zip ties to hold it on the stem, but it is a snap fit and I have ridden without the velcro or zip ties. My stem is 35mm diameter The battery pack is this one: https://www.anker.com/products/variant/PowerCore-5000/A1109011
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