Smooth out the aesthetics of your Shimano Di2 electronic system with this internally-mounted battery.
The SM-BTR2 is a rechargeable internal battery for use with Dura-Ace Di2 9700 and Ultegra Di2 6070* component systems. It's installed inside the seatpost, and includes slotted shims for accommodation to a wide range of seatpost sizes. It is charged using the port on the EW90-A/B cockpit junction box or SC-705 display unit, and requires the SM-BCR2 charger.
Weight: 56 grams. Charges in approximately 1.5 hours. Charger (SM-BCR2), wiring kit, and frame mount sold separately.
*Requires a firmware update. You will need the SM-PCE1 PC Tool to install this update, which can be downloaded at http://e-tubeproject.shimano.com. Alternatively, the most recent firmware can be installed at your local Shimano Service Center.
Model Number: ISMBTR2A