SHIMANO Di2 BT-DN1110 Battery - Bluetooth Enabled;

The updated Shimano Di2 BT-DN1110 battery is now Bluetooth-enable and fully compatible with Shimano's E-Fly module. This allows the battery to talk to a Bluetooth-compatible cycling computer to deliver battery and system information, so you'll know when it's time to recharge. This slim battery fits easily inside most seatposts (aero posts may require an adapter), connects up with Shimano's standard E-Tube technology, and is good for roughly 1,200 miles per charge (depending on conditions and number of shifts).Features: Use with the Shimano Di2 shifting system Stealthily fits in seat posts and other internal mounts Compatible with Shimano's E-Tube technology for precise shifting in all conditions Weighs just 0.2lbs or 50g Measures 2x3x9 inches Compatible with: Dura-Ace 9170 and 9070, Ultegra 6870, and 6770