Shimano BCR2 vs EC300 Charging Cable
Quick Answer
SM-BCR2 and EW-EC300 are not the same Di2 charging format. Shimano lists SM-BCR2 as a battery charger and PC linkage device for internal Shimano Di2 BT-DN110 batteries, while EW-EC300 is described for newer 12-speed Di2 road drivetrain charging through the rear derailleur.
This comparison page should help riders avoid buying the wrong cable.
BCR2 vs EC300 Comparison
| Item | SM-BCR2 | EW-EC300 |
|---|---|---|
| Primary role | Battery charger and PC linkage device | Di2 charging connector |
| Shimano-listed battery/use | Internal Di2 BT-DN110 battery charging | Newer 12-speed Di2 road drivetrain charging |
| Connection context | Also used for E-TUBE PROJECT firmware/settings linkage | Attached to the rear derailleur for charging |
| Buyer risk | Wrong choice if the bike uses the newer EC300 connector | Wrong choice if the bike needs the older BCR2 device |
How Riders Should Choose
- Check the current charger or cable name if available.
- Look at the charging port location and connector shape.
- Confirm drivetrain generation and battery type.
- Use the bike manual or Shimano compatibility resources when unsure.
Shopify SEO Angle
This is a strong page for search because riders actively compare BCR2 and EC300 before buying. Include internal links to both VELYN Di2 charging products after the comparison, not before it.
VELYN Product Angle
If the customer needs BCR2-style charging, point them to the VELYN BCR2-compatible charging cable. If they need EC300-style charging, point them to the EC300-compatible adapter. Both CTAs should include a fitment confirmation note.
Recommended Product Link
VELYN Charging Cable Compatible with Shimano BCR2 Di2 DN110
FAQ
Are BCR2 and EC300 interchangeable?
Do not treat them as interchangeable. They serve different Di2 charging contexts and buyers should confirm their exact system.
What does SM-BCR2 do?
Shimano lists SM-BCR2 for charging internal Di2 BT-DN110 batteries and as a PC linkage device for E-TUBE PROJECT updates and settings.
What does EW-EC300 do?
Shimano describes EW-EC300 as the charger cord for newer 12-speed Di2 road drivetrains, attaching to the rear derailleur.