The Ultimate Lithium Battery and Lithium Ion Battery Charger for Di2
Precision power for internal seat-post batteries. Compact, reliable, and race-ready.
Happy Customers
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Loved Across Britain
CyclingCharger
£19.99 inc. VAT (£16.66 ex. VAT)
A high-precision USB lithium battery charger designed specifically for internal Shimano Di2 seat-post batteries via the handlebar or frame junction box.
Free UK Delivery
Dispatched via Royal Mail Tracked from our UK hub
UKCA Certified
Fully tested to UK safety and electrical standards
30-Day Returns
No-quibble returns for any compatibility issues
Junction-Box Ready
Designed for direct connection to SM-EW90 & EW-RS910
Charging Guide
- Locate the charging port on your bike's junction box (usually under the stem or in the bar-end).
- Open the protective rubber flap on the junction box.
- Insert the charger's specialised plug into the port, ensuring correct orientation.
- Connect the USB-A end to a 5V power source.
- The orange LED will illuminate to indicate charging; it will turn off once the battery is at 100% capacity.
Trusted by UK Road Clubs & Triathletes
Rider Feedback
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.
Based in the heart of the UK cycling scene, CyclingCharger was founded by a team of club riders and mechanics who grew tired of the confusion surrounding electronic drivetrain spares. We realised that finding a reliable, UK-certified charger for internal seat-post batteries shouldn't require a degree in engineering.
Our mission is to simplify the technical. We specialise exclusively in power solutions for electronic shifting systems like Shimano Di2. By focusing on a single category, we ensure every product we stock meets rigorous UKCA and CE standards, providing the peace of mind that your premium carbon frame and expensive groupset are in safe hands.
Whether you're preparing for a weekend in the Peak District, a mid-week crit race, or an Ironman event, we provide the dependable gear you need. From our UK warehouse to your workshop, we prioritise speed and technical clarity above all else.
Why UK Customers Love Us
Our products are designed and supported in the UK, ensuring superior quality and fast tracked delivery from our British warehouse. We offer free UK delivery on all orders, eco-friendly packaging to reduce carbon footprint, and warm, direct customer service. Every order is backed by a generous 30-day returns policy under the UK Consumer Rights Act 2015 — you are always protected.
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