"What Our Gearhead® Experts Are Saying:""This battery made my Di2 upgrade seamless. It installs quickly in the seat tube, barely adds weight, and delivers all-season runtimes—huge step up from the older version.""BT-DN300 Battery is the brains behind the next generation of Shimano’s Dura-Ace and Ultegra Di2 systems, supporting advanced wireless shifting for road, gravel, and cyclocross bikes. Packed into a compact, 59g design, it mounts stealthily in the seat tube to power both front and rear derailleurs via a single, low-profile connection. The upgraded 300-series wiring boosts reliability and integrates seamlessly with Shimano’s latest wireless controls, making setup fast and essentially maintenance-free. Engineered for longevity, the BT-DN300 delivers increased charge and extended runtimes compared to previous generations, meaning more rides between plug-ins for those who train or explore year-round. The battery also features consistent voltage output—key to smooth shifting and quick response under racing or adventure conditions. Officially compatible only with the new 12-speed Di2 series, this battery is a must-have for those futureproofing a high-performance drivetrain or refreshing a modern, wireless setup."
Price: $175.74 from Backcountry
| Merchant | Price | |
|---|---|---|
| $175.74 | Visit Store |
When building our dream bike, we don't want to worry about shifter battery life down the road. The Shimano EW-JC304 Di2 4-Port Junction allows us to connect both shifters directly to the battery for 50% more battery life.
At a time when electronic drivetrains are gaining unstoppable traction, we appreciate that Shimano chose not to neglect its storied pro-level mechanical drivetrain for Di2, making careful, meticulous updates that have resulted in subtle, but significant,...
One of the driving forces behind the electronic shifting concept is the ability to place buttons in places that are impossible with conventional cable and housing systems. Designed to be mounted in the drop section underneath the handlebar tape, the Di2...