Shimano SM-BTR1 Di2 External Mount Battery

  • The heart of Shimano Di2
  • Lightweight & robust
  • Lithium Ion battery technology
WAS £76.99
SAVE 11%
Stock Status:
Stock due soon - order now for despatch in 7 days

The heart of the Di2 electronic shifter groupset, the Shimano Lithium-Ion battery is compact and highly reliable. A single-wire E-tube connection and new junction units give the battery a cleaner look and easier installation. The sealing and reliability have been proven through rigorous testing in virtually every riding condition you would expect to encounter. Extreme temperatures, mud, rain and cobble stone roads, this battery can take a lot of punishment.

The use of a single battery creates a system that is lightweight and robust, as opposed to current wireless systems which require up to four separate battery units. A single charge of this battery can last from 1000 to 2000 kilometres, depending on the front derailleur usage, as this requires the most of power.

  • Easily removable for charging.
  • Weight: 68g

Please note: Due to the lithium-ion battery contained within, this item requires a specialist postal service and therefore is sadly excluded from the free delivery offer.


Brand Shimano

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Finance Options

In order to get the kit you want, when you need it, without ruining the family finances we offer a highly flexible range of finance options to help you get the best products on your bike now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.

D.T.(Automotives) Limited T/A Tweeks Cycles is authorised and regulated by the Financial Conduct Authority and is the broker and not the lender. Our FCA registration number is 689896. D.T.(Automotives) Limited offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance and Klarna. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority.

Delivery & Returns

UK Mainland Delivery Prices

Delivery Type Cost Estimated Delivery Time
Standard Delivery for orders under £49.99 from £1.33 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)
Standard Delivery for orders over £49.99 Free
Express Delivery from £1.68 1-2 working days from day of despatch(Excludes weekends and Bank Holidays)
Special Delivery from £12.54 For any next working day delivery order before 4pm Monday to Thursday.
For any weekend delivery order before 4pm Friday
Click & Collect from £7.62 Collect your parcel from a local post office. 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)

For international shipping please visit our delivery page.

For information about returning an item please visit our returns page.