Pro-Series Lithium Battery Charger for Internal Di2 Systems
£19.99 inc. VAT (£16.66 ex. VAT)
- Purpose-built for internal Shimano Di2 batteries, ensuring safe, reliable charging every time.
- USB charging input makes top-ups easy from power banks, laptops or mains adapters.
- Compact travel-friendly design slips into kit bags for race days and weekend rides.
- Great-value £19.99 replacement charger saves replacing your whole Di2 charging setup.
Why Choose CyclingCharger
Precision Charging for Electronic Shifting
Never get caught with a flat battery on the morning of a big ride. Our Pro-Series lithium battery charger is the essential tool for owners of Shimano Di2 electronic shifting systems using internal batteries (SM-BTR2 or BT-DN110). Designed to plug directly into your SM-EW90-A/B or EW-RS910 junction box, it provides a stable, safe charge to keep your shifting crisp and reliable.
Compact & Travel Ready
Unlike bulky workshop chargers, this unit is powered by a standard USB-A connection. This makes it the perfect companion for cycling holidays, sportives, and race weekends. You can charge your bike from a laptop, a USB wall plug, or even a power bank in the team car. The lightweight, durable housing is built to withstand being tossed into a kit bag or toolbox.
Safety & Compatibility First
We understand that your bike is a significant investment. That's why our charger features built-in overcharge protection and short-circuit prevention. It is specifically calibrated for the voltage requirements of Shimano's internal lithium-ion cells. Please note: this charger is for internal systems only and connects via the junction box; it is not for use with external battery mounts or e-bike drive systems.
Technical Specifications
- 5.0V DC (USB USB-A)
- 8.4V DC
- 1.0A
- Approx. 1.5 - 3 hours
- SM-BTR2, BT-DN110 (Internal)
- Specialised Di2 Junction Plug
- UKCA, CE, RoHS
- 45g (Unit only)
Price Comparison
See how our price compares across UK retailers
| Retailer | Price | Delivery | Warranty |
|---|---|---|---|
| CyclingCharger UKBEST | £19.99 | FREE | 12 months |
Prices checked 13 May 2026. Prices may vary.
Customer Reviews
Lost my original Shimano charger before a trip to Mallorca. This arrived next day and worked perfectly with my Ultegra Di2 setup. Saved the holiday!
Solid bit of kit. The connection to the junction box feels secure and the charging time is exactly the same as the OEM version. Essential for any Di2 owner.
I keep this one in my race bag and the original at home. It's lightweight and the USB connection means I can charge from my power bank if I forget to plug in the night before.
Great charger, much cheaper than the local bike shop. Only downside is the cable could be 20cm longer for when the bike is on a high workstand.
Clear instructions on the site helped me confirm this was the right model for my internal battery. Fast delivery to London.
Does exactly what it says. It's a simple lithium battery charger that fits the Di2 port perfectly. Good value compared to branded alternatives.
As a triathlete, I'm always travelling. This is compact enough to live in my transition bag. Never had a single issue with it.