Shimano Di2 SM-BTR2 Internal Battery

Dura-Ace Di2 (Dual Integrated Intelligence) moves to the next generation. Tested in competition and taken to victory by pro riders in all conditions, including the 2012 Tour de France Team Sky.

The lithium-ion battery is now available in two versions, this version being mounted inside your frame. It can be charged without removing it from your frame, and weighs less than half as much as the external battery.

Key Features:

• The power house of Dura-Ace Di2 is a long-life 7.4V Li-Ion battery that is both compact and reliable, taking shifting effort away from you.
• Mount the battery inside your seat post to maintain your bike's clean aesthetic.
• Fully sealed against any water that might work its way inside your frame.
• One charge can give between 1000 and 2000 (around 1200 miles) kilometre range depending on conditions and front derailleur operation (as this is the main power drain).
• Can be charged in situ through stem-mounted junction box.
• Includes multiple slotted leaf spring mounts, to fit snugly inside any diameter seat post.
• Weight: 56g (manufacturer claimed).
• Compatible with the FlightDeck computer, measuring important data such as heart rate, altitude, cadence, gear position, battery indicator and allowing you to customise the shifting action of the derailleurs.