Di2 Battery Holder for 27.2 mm Seat Posts


Notify me when this product is available:

This battery holder is for Shimano Di2 internal SM-BTR2 and BT-DN110 batteries. The battery fits inside the seat post and typically requires a seat post made specifically for Di2.  This holder allows the battery to be held securely within a non-Di2 specific 27.2 mm seat post found on most bikes.

Collections: Di2-eTAP Conversion Accessories

Why use a holder instead of tape or foam?

C'mon, you spent lots of money on your Di2 build just to install your battery with tape and foam?  Ad hoc solutions using tape and foam have multiple issues. The net result is often a damaged or stuck battery.

Problems with Tape or Foam:

  • They don't protect the delicate battery connection
  • Tape or foam can shrink, causing the battery to fall out
  • They can cause the battery to overheat
  • Tape, especially, can fuse to the inside of the seat post

Battery Holder Sizes

We make Di2 battery holders for 27.2 mm seat posts with 21 mm through 23 mm inside diameters.  If the measurement is more than .5 mm from the available sizes or an odd shape (tapered internal tube, aero, etc.), contact us for a custom version. 

Related Items