The Shimano STEPS BT-EN605 packs 504Wh of capacity into a compact, semi-integrated frame design — giving your eMTB or e-trekking bike the range and resilience to take on longer adventures without compromise. Built for second-generation Shimano STEPS systems, it pairs directly with the EP8 (DU-EP801) and EP6 (DU-EP600) drive units and mounts cleanly to the downtube or seattube via the BM-EN600 battery holder (sold separately).

Highlights

• 504Wh capacity (36V / 14Ah): top-tier range for trail, commute, and all-day riding.
• IPX5 water resistance: built to handle rain, trail spray, and mud without hesitation.
• Lightweight at 2.55 kg: high energy density keeps the weight penalty minimal.
• Long battery life: retains more than 60% of initial capacity after 1,000 full charge cycles.
• Fast charging: fully charged in approximately 4.5 hours with the EC-E8004 charger.
• Dual drive unit compatibility: works with DU-EP801 (EP8) and DU-EP600 (EP6) systems.
• Flexible mounting: installs on downtube or seattube for versatile frame integration.
• Secure lock mechanism: stays firmly in place on rough terrain; quick-release for easy removal.

Range & Performance

At 504Wh, the BT-EN605 sits at the top of Shimano's standard frame battery range. Whether you're running Eco mode on an all-day gravel adventure or drawing full power from EP8's high-torque output on demanding singletrack, the BT-EN605 has the capacity to keep you riding. The integrated battery management system actively protects cell health, ensuring consistent performance across thousands of charge cycles and multiple riding seasons.

Design & Integration

The BT-EN605 uses a semi-integrated (external frame) mounting approach — it sits flush against the frame in a dedicated BM-EN600 battery holder, delivering a clean aesthetic without requiring a fully integrated frame cutout. The compact profile positions weight low and centred for predictable, balanced handling. The secure locking mechanism keeps the battery in place on rough terrain while still allowing straightforward removal for overnight charging or secure storage.

Compatibility & Fit

Compatible drive units: DU-EP801 (EP8) and DU-EP600 (EP6). Requires BM-EN600 battery mount (sold separately). Recommended charger: EC-E8004 (approx. 4.5-hour full charge from 0%). Operating temperature: −10°C to 50°C. Charging temperature: 0°C to 40°C. Colour: Black.