Built-in Type Battery

With the launch of Dura-Ace 9100 came new firmware offering road riders Synchronized Shifting options between front and rear derailleurs. A short while later this technology was made available to Ultegra 6800-series and Dura-Ace 9000-series riders who have the latest Di2 battery.

The new battery (BT-DN110/BT-DN110-a) contains a memory chip that can handle the processing power required to deal with the multiple shift patterns and customizations that Synchronized Shifting brings, offering you the choice to suit your gear positioning to your personal riding style.

In order to charge this battery just connect your SM-BCR2 to either your internal or external junction box and plug it into a power socket or laptop.

If you’re planning on putting this battery in your seatpost you will probably also want a seatpost battery mount. You can easily find those on AmazonChain Reaction Cycles or eBay, All major manufacturers make them.

External mount

It is possible to mount this battery outside the frame, if your bike or seat post does not support internal mounting. You can use the external case SM-BTC1 to mount it outside the frame. It also doubles as a 6-port Junction B.

BT-DN110 battery

Details & specifications

Shimano model codeBT-DN110, BT-DN110-A
Shimano model nameBuilt-in Type Battery
Weight50 g
SeriesUltegra 6770, Ultegra 6780, Ultegra R8000, DURA-ACE 9070, DURA-ACE R9150
Downloads BT-DN110 manual
View on Amazon (new tab)  |  eBay (new tab) Chain Reaction Cycles (new tab)

Shopping links

Are you looking to upgrade your bike using this component? We've added shoppings links to this component's Amazon and eBay pages. Click the images below to view the Amazon product page or eBay search results.

Click to view on Amazon
Click to search on eBay
Click to search on Chain Reaction Cycles

Installation guide

Read how to install the BT-DN110 internal battery in your seatpost in our Di2 internal seatpost battery installation guide.


There are two different versions of the BT-DN110 Internal battery available, the BT-DN110 and BT-DN110-A. The latter is grey, not black, newer and slightly better built. The functionality of both batteries is the same.

BT-DN110 versions