A friend and I are working on designing a power meter to affix to the crank arms on our bikes (similar to Stages, 4iiii, etc). The enclosure will house a small PCB connected to strain gauges, and we will need to either be able to replace coin cell batteries (CR2032) or charge a permanent LiPo battery. I'm leaning towards the permanent battery, but wondering: what kinds of connectors might work for this? Most waterproof, panel-mount bulkhead feedthrough connectors I've found are far too big for this application. We'd really only need to connect two wires (DC +/-), and could use a through-hole part or panel mount style connector. Has anyone found/used something like this? An example of what would work is the connector Garmin uses in their watches. However, I can't seem to find this kind of connector available for purchase, and am guessing it's proprietary.
Relatedly: would a coil for wireless charging interfere with BLE transmission? Wireless charging seems like it would be a perfect solution here, but BLE is critical in this application.