Di2 battery holder - Nex-Gen Sports

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PRO Di2 Battery Holder for 30.9 - 31.6mm SeatPost

The new EC300 charging connector is designed specifically for Shimano's 12-speed Di2 road drivetrains. Connected via the rear derailleur, it is also compatible with Shimano power meters. Charging of the new Shimano 12-speed Di2 road drivetrains is now accomplished with the EC300 charger cord. Attached to the rear derailleur, this new cord is less expensive than previous chargers and can also be used to charge Shimano power meters.

Shimano EW-EC300 Charging Cable

Di2 battery holder - Nex-Gen Sports

Batteries Shimano Di2. Il faut acheter la batterie, le chargeur et le câble d'alimentation pour compléter le système.

Shimano BT-DN110 Di2 Battery

Shimano Di2 Battery Mount For Specialized Tarmac SL7 Seatpost Holder DN110 DN300

Deda DBA Di2 Battery Holder

Shimano SM-EW90A E-Tube Junction Box : : Sports & Outdoors

Trek Speed Concept Di2 Battery Holder Assembly - Trek Bikes (CA)

Trek Madone SLR Internal Di2 Battery Holder - Trek Bikes (CA)

Madone SLR 6 Gen 7 AXS - Road bike - Sports aux Puces VéloGare

I just finished upgrading my Trek Checkpoint to GRX Di2 (Pics coming soon). I've seen it asked many times for wire lengths and a full component list, but never documented in one place. So I made this guide. Everything you need to upgrade a 2019 - 2021