Shimano BT-DN110-A Internal Battery

BT-DN110-A: Flexible Mounting and Long Lifespan
The BT-DN110-A lithium-ion battery is an essential power source for the electronic Di2 system, with a capacity of 500 mAh. Mounting is flexible: internally, the battery can be placed in the head tube or seat post. For external mounting, the optional SM-BTC1 bracket is necessary. This battery delivers high performance and an impressive lifespan of up to 2,000 km on a single full charge.

Specifications and Connection Cables
The battery has compact dimensions of Ø17 mm in diameter and 160 mm long. For connection to the Di2 system, the optional EW-SD50 cables are required, which are available in a range of different lengths (from 250 to 1400 mm). An important note is that the battery may only be charged with the SM-BCR2 charger.

Firmware Requirements for Optimal Operation
For proper and trouble-free operation of the electronic Di2 drivetrain, it is crucial that all individual components have the same firmware version. Using components with different firmware versions can lead to malfunctions or functional disorders. The firmware can be read out or updated using an optionally available diagnostic device.