The Shimano Di2 Battery Charger with USB plugs right into the SM-EW90 junction so that batteries chan be charged while it is still attached.

Features

• Di2 uses a powerful long-life 7.4V Li-Ion battery: keep it in top condition and ready for shifting with this specific Shimano Di2 charger
• 1.5 hour charge time
• Plugs in directly to the SM-EW90 handlebar junction A
• Can also be used for completing firmware updates when linked to E-tube software on your.