Shimano BT-DN110-A Internal Built-In Type Di2 Battery

The Shimano BT-DN110-A Built-In Type Di2 Battery is the power source for Shimano's 11 speed Di2 derailleurs and shifters. Its thin, sleek profile allows the battery to fit in seat posts or frames for a clean look.

Charger not included

Features:
SD50 connection port
Waterproof design
Compatible with SM-BCR2 charger
Specifications:
Battery Chemistry: Li-Ion
Rated Voltage: 7.4V
Rated Capacity: 0.5 Ah / 3.7Wh
Port: SD50
Weight: 51g