SHIMANO Di2 Internal Battery Bt-DN320 310mAh — Internal Seatpost/Frame, Removable

SHIMANO Bt-Dn320 is an internal Di2 battery designed to tuck inside a seatpost or frame, delivering steady 310 mAh power to your XT/XTR electronic shifting with three SD300 ports for wired or semi-wireless setups.

Compact, removable, and built to withstand off-road use, the Bt-Dn320 is made for riders who prefer a clean cockpit and reliable power delivery. It pairs with Shimano 12-speed Di2 groupsets (including R9250 and R8150) and provides an extra SD300 port so you can add a wired backup cable on long rides or when running fully wired configurations. The battery’s robust construction keeps it secure inside enclosed spaces while remaining simple to remove for charging.

How does the Bt-Dn320 fit into my bike and Di2 setup?

The Bt-Dn320 is sized to install internally in compatible seatposts or frame cavities and integrates with Shimano wireless-capable rear derailleurs. Installation keeps the battery hidden for a minimalist look while preserving full electrical access through the SD300 ports. Removal is tool-friendly for off-bike charging.

• Internal seatpost or frame-mount compatible
• Integrates with wireless XT/XTR rear derailleurs
• Removable design for easy charging
• Maintains clean cable routing and cockpit aesthetics

What charging/runtime can I expect from a 310 mAh internal Di2 battery?

The 310 mAh capacity balances compact size and practical runtime for typical road and gravel use. Actual runtime depends on system configuration, cadence of shifts, and whether components run semi-wireless or wired. The removable battery design makes top-ups convenient between rides.

• 310 mAh nominal capacity for extended riding sessions
• Charging frequency varies with shifting habits and accessories
• Removable for off-bike charging to keep your bike ready
• Use of the SD300 port can reduce wireless power draw in wired setups

Why is the third SD300 port useful for long rides and remote routes?

The extra SD300 port gives you a simple, wired backup option when you want maximum reliability on endurance rides. It allows a direct power/communication line to derailleurs or junctions so you can run fully wired configurations or use a tethered backup if wireless signals are a concern. That flexibility helps eliminate single-point failures in remote areas.

• Third SD300 port supports wired backup connections
• Enables fully wired Di2 layouts if desired
• Useful for long, remote rides where redundancy matters
• Allows combining wireless convenience with wired reliability

How rugged and serviceable is the Bt-Dn320 under real-world conditions?

Shimano built the Bt-Dn320 from durable materials to resist the impacts, vibration, and weather commonly encountered off-road. The battery stays secured within an enclosed space so it won't shift on rough terrain, yet it’s designed to be removed easily for charging or replacement. Routine maintenance is straightforward: remove, charge, reinstall.

• Durable construction for challenging weather and trails
• Protected internal mounting prevents movement in rough terrain
• Removable for straightforward charging and servicing
• Compatible with current Shimano 12-speed Di2 platforms

Who is this for? The SHIMANO Bt-Dn320 suits riders who want a streamlined, professional-looking Di2 setup with flexibility for wired or semi-wireless configurations. It’s ideal for cyclists using 12-speed R9250 or R8150 Di2 groupsets who value durability, the convenience of easy off-bike charging, and the option of a wired backup for long rides or remote adventures.