Quick answer
Pack the charging accessory that matches each bike's exact interface, a suitable power source and cable, and a charged spare if the system uses a compatible removable battery. Label the pouch by bike or drivetrain, then test the complete setup before travel. A USB connector on the power-source side does not make different bike-side charging interfaces interchangeable.
Choose by interface, not by the drivetrain brand alone
| Setup to check | What to compare | Relevant product at VELYN |
|---|---|---|
| Selected SRAM AXS/eTap-style removable battery systems | Battery shape, contacts and charging method | 500mAh battery with direct USB-C charging or compatible charging dock |
| Selected Di2 12-speed EC300-style interfaces | The component model and four-pin charging port | USB-C adapter or 1.5 m charging cable |
| Selected Di2 SM-BCR2 / BT-DN110-style configurations | Charger, internal battery, connector and generation | compatible USB cable and interface |
| Selected STEPS off-bike battery charging setups | Both battery and charger models | SM-BTE60-compatible adapter or SM-BTE80-compatible adapter |
These are different product families. Confirm the stated fit for your equipment before buying. An adapter does not replace a compatible charger, battery or power supply unless the product's package explicitly includes them.
The evening-before checklist
- Read the model numbers on the bike component, battery and charger.
- Connect the complete charging setup at home and confirm that it operates.
- Charge the installed battery and any compatible spare you plan to carry.
- Pack the required bike-side accessory, power-source cable and suitable power source together.
- Keep spare battery contacts away from loose metal tools and keys.
For riders traveling with more than one bike
Use a separate labeled pouch for each charging setup. Record the component and connector names rather than relying on cable color. A spare USB cable is useful only if the bike-side interface and required charging accessory are also present. Do not force an unfamiliar connector or improvise a charging connection.
At the venue
Before leaving for the start, check charge level, battery retention and actual shifting or component operation. If charging fails, inspect the cable, suitable power source and connector. A damaged battery or connector needs attention before use; extra force is not a fit check.
Frequently asked questions
Can one cable charge every electronic drivetrain?
No. Bike-side interfaces and charging arrangements differ. Identify your exact setup with the BCR2 vs EC300 guide or the STEPS adapter comparison.
Does an e-bike charging adapter replace the charger?
No. The listed STEPS adapters provide a connection for selected battery and charger combinations; they are separate from the charger and battery.
Where can I check a removable AXS-style battery?
Use the compatibility checklist and compare your component with the product photos. Fit is specific to the battery interface.
VELYN is part of ALLTOO. Products described as compatible replacements are independent third-party accessories, not original SRAM, Shimano or Wahoo products.