Di2 Battery Holder for Round Seatposts | Shimano BT-DN300, 20-29mm Internal Diameter

Secures internal Di2 batteries inside round seatposts  |  Flexible rubber, multiple damping rings  |  Two sizes: 20-23mm and 21-29mm Internal Diameter

This sleeve holds the Di2 battery firmly inside a round seatpost, cutting down on the movement that leads to rattling or a loose-feeling battery while riding. 

It's made from flexible rubber and uses multiple damping ring structures to grip the inside of the post, and built-in positioning tabs (limit stop design) make it easier to install and remove.

Designed for batteries like the Shimano BT-DN300 and similar internal seatpost battery systems, and comes in two sizes to match your seatpost's inner diameter.

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Specifications

Made of Rubber

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Notes

• Not recommended for non-round/irregular shaped seatposts
• Measure your round seatpost's inner diameter before purchase
• Designed for round seatposts only
• Make sure the battery and wiring have enough space inside the seatpost
• Do not force the installation if the sleeve is too tight or doesn't match your seatpost
• Manual measurements may have slight tolerance

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