Shimano Di2 Internal Battery SM-BTR2

Shimano Di2 Batteries. Must purchase battery, charger, and power cable to complete the system.* Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/* All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions* Charge internal battery with USB power adapter (SM-USB1) through port on EW90-A/B cockpit junction box or SC-705 display unit* Not compatible with Dura-Ace 7970 Di2 systemsItem Specifications---Shifter/Derailleur Compatibility: E-Tube

Shimano Di2 Batteries. Must purchase battery, charger, and power cable to complete the system.