This adapter is built for Shimano's 12-speed Di2 electronic groupsets, including Dura-Ace R9200, Ultegra R8100, and 105 R7100, and it connects to the same 4-pin charging port used by these derailleurs. If you are riding an older 11-speed Di2 setup or are unsure which generation your bike uses, it is best to check your derailleur model with us before ordering, since older Di2 systems use a different charging interface.

Yes, that is the whole point of this adapter. Once it is plugged into your derailleur, you can charge from any regular Type-C cable and a standard 5V wall adapter or power bank, the same kind you would use to charge an Android phone. We recommend sticking to a reasonably branded power source, since very cheap or unbranded power banks can sometimes deliver unstable voltage that is not ideal for precision electronics like a Di2 battery.

This adapter plugs directly into the 4-pin charging port on your derailleur, in place of the original Shimano cable. From there, you connect a regular Type-C cable into the adapter and into your power source. You do not need the original OEM charging cable at all once you have this adapter, which is exactly why it works so well as a lightweight travel or saddle-bag backup.

This is a third-party accessory designed to fit Shimano's 12-speed Di2 charging interface, not an official Shimano-branded product. That said, it is built with precision copper pin contacts for a secure, stable connection, and every unit is checked before it ships from DoGoodCo so you receive a fully functional, tested adapter rather than a random import gamble.

It weighs around 4 grams and measures roughly 2.3 x 2.1 x 1.5cm, so it is small enough to disappear into a saddle bag, jersey pocket, or even a keychain pouch without adding any noticeable weight. It also comes with a small strap so you can clip it to your bag zipper and always have it on hand for a quick charge wherever you are.

If your adapter arrives damaged or stops charging your derailleur properly under normal use, reach out to our support team with your order number and we will sort out a replacement. Since this is a small precision electronic connector, we recommend keeping it in a bag or pouch rather than loose in a saddle bag to avoid bent pins from impact.

Orders are typically dispatched within 3 working days of order confirmation. Actual delivery time after that depends on your pin code and courier serviceability in your area. All orders on DoGoodCo are prepaid at checkout, so cash on delivery is not available at this time.