The adapter is widely praised as an effective, affordable solution for charging Shimano 12-speed Di2 systems using standard USB-C cables, with recent versions showing improved build quality.
Pros
- Solves the problem of losing the specific Di2 charging cable
- Allows charging with any USB-C cable
- Compact and portable (can be attached to a keychain)
- Easy to test and use (blue light indicates charging)
Key Facts
- Connects to the rear derailleur for charging
- Uses USB-C input (5V)
- Casing made from cast ABS plastic
Reviews & Ratings

The reviewer discusses the RRSkit battery charger adapter for Shimano 12-speed Di2 groupsets, highlighting it as a solution to the common problem of losing the specific Di2 charging cable. He demonstrates its functionality by connecting it to a USB-C cable and successfully charging the Di2 system, validating its effectiveness.
AI Summary
Pros
- Solves the problem of losing the specific Di2 charging cable
- Allows charging with any USB-C cable
- Compact and portable (can be attached to a keychain)
- Easy to test and use (blue light indicates charging)
- Affordable price
- Validated as functional
Key Points
- Adapter from RRSkit brand
- Connects to rear derailleur
- Uses USB-C cable for charging
- Includes a small sticker
- Blue light indicates charging status
- Compatible with Shimano 12-speed Di2 groupsets (Dura-Ace R9200, Ultegra R8100, 105 R7100)
Received the 12s Di2 charger that was discussed many pages back when it was a mixed bag quality. This one is branded RRSKit. Looks like a serious factory has taken up this design: no more 3d printing, the casing is cast from ABS plastic, all contacts and ports look solid. Works perfect both with a mains charger and my power bank. Definitely recommend.
Received the 12s Di2 charger that was discussed many pages back when it was a mixed bag quality. This one is branded RRSKit. Looks like a serious factory has taken up this design: no more 3d printing, the casing is cast from ABS plastic, all contacts and ports look solid. Works perfect both with a mains charger and my power bank. Definitely recommend.
Where to Buy
Rrskit Batterieladegerät-Adapter für Shimano 12-Gang Di2-Gruppen Dura-Ace R9200/Ultegra R8100/105 R7100 Electronic Shifting - AliExpress 18

Questions about Rrskit Battery Charger Adapter For Shimano 12-Speed Di2 Groupsets Dura-Ace R9200/Ultegra R8100/105 R7100 Electronic Shifting
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