Shimano Di2 seat post battery adapter
thingiverse
Adapter to fit the Di2 battery into a non compatible seat post. Most recent version: https://www.prusaprinters.org/prints/59181-shimano-di2-seat-post-battery-adapter *Update:* Changed adapter to a 2 part design (instead of 3). For a seat post with an inner diameter of 21.8mm 3 o-rings (17x2) give a good fit. The battery does not move at all.
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