Quick answer
SM-BCR2 and EW-EC300 identify different Di2 charging arrangements. Shimano describes SM-BCR2 as a charger for internal BT-DN110 batteries with PC-link functions, and EW-EC300 as a cord used at the rear derailleur on compatible 12-speed Di2 road systems. Identify your actual charging port and component before buying.
The ALLTOO set includes a charging/connection module and matching cables for selected Shimano Di2 SM-BCR2 / BT-DN110-style configurations. Identify the battery or component model, connector shape and intended task before purchase. Computer connection, diagnostic and firmware functions require confirmation for the exact hardware and software.
Compare the charging formats
| Format | Manufacturer-described use | VELYN option to investigate |
|---|---|---|
| SM-BCR2 / BT-DN110-style | Suitable internal Di2 battery charging arrangements | ALLTOO Charging/Connection Module with Cables, Compatible with Shimano SM-BCR2 / BT-DN110 |
| EC300-style adapter | Compatible rear-derailleur charging interface | ALLTOO USB-C EC300-compatible adapter |
| EC300-style cable | Compatible charging interface with a cable connection | ALLTOO 1.5 m magnetic EC300-compatible cable |
| Selected Di2 11-speed setup | Generation alone is not a connector specification | ALLTOO Di2 11-speed USB charger; check the exact interface |
Do not transfer OEM PC functions to every replacement
The PC-link capability of Shimano's original SM-BCR2 does not prove that every aftermarket cable supports the same updates or diagnostics. VELYN's BCR2-compatible listing states that computer and diagnostic functions depend on the bicycle components and software. Confirm the required function before purchase.
Choose by the existing hardware
- Record the charger, battery and component model numbers.
- Compare charging-port location and connector shape.
- Confirm the intended function: charging, a spare cable, or a PC link.
- Ask for clarification if the current listing does not confirm your configuration.
Manufacturer references
See Shimano's SM-BCR2 page and EW-EC300 page for the original equipment descriptions. These establish the format distinction, not certification of ALLTOO accessories.
Frequently asked questions
Are BCR2 and EC300 interchangeable?
Do not treat them as interchangeable. Match the actual system and connection.
Will a charging cable also update firmware?
Only rely on that function when it is confirmed for the accessory, components and software you use.
Are these official Shimano chargers?
No. The linked products are third-party compatible accessories.
VELYN is part of ALLTOO. Current prices and options are shown on the linked product pages. Shipping eligibility and fees depend on the destination and product; review our shipping policy and return policy.
Product views and fit checks
Compare your exact component with these views from the VELYN product listing. Check the model, connector or mounting arrangement before choosing an option.
