The Shimano STEPS BT-EN805-L is a 504Wh second-generation integrated down tube battery engineered for e-MTB systems running the EP801 or EP600 drive unit. Its slim, frame-integrated housing keeps weight low and centred — maintaining the handling characteristics of a conventional mountain bike while delivering a full day of trail riding from a single charge.

Highlights

  • 504Wh capacity (36V, 14Ah): ample range for extended trail sessions in a compact, integrated package.
  • Frame-integrated design: mounts inside the down tube or seat tube for a clean, stealth aesthetic and a low centre of gravity.
  • Drive unit compatibility: works with Shimano STEPS DU-EP801 and DU-EP600 second-generation systems.
  • IPX5 water resistance: withstands rain and low-pressure washing — ready for year-round trail riding.
  • Fast charging: reaches a full charge in approximately 5 hours via the EC-E8004 or EC-E6002 charger.
  • Long service life: retains more than 60% of initial maximum capacity after 1,000 full charge cycles.

Performance & Longevity

With 504Wh of usable capacity, the BT-EN805-L delivers meaningful range across a wide variety of terrain and assist modes. Shimano's battery management system optimises cell health over the long term — the battery is rated to retain more than 60% of its initial maximum capacity after 1,000 full charge cycles. Charging via the EC-E8004 or EC-E6002 charger (SM-BTE80 or EW-CP100 charging adapter required) takes approximately 5 hours from flat.

Trail-Ready Durability

Built specifically for e-MTB use, the BT-EN805-L carries an IPX5 water-resistance rating, making it well suited to riding in wet conditions and routine post-ride washing. The operating temperature range of -10°C to 50°C covers typical Australian trail conditions year-round, while the charging temperature range of 0°C to 40°C suits most workshop and garage environments.

Compatibility & Fit

The BT-EN805-L is designed for second-generation Shimano STEPS integrated down tube battery mounts and is compatible with the following components:

  • Drive units: DU-EP801, DU-EP600
  • Battery mounts: BM-EN800-A, BM-EN800-B, BM-EN801-A, BM-EN801-B
  • Chargers: EC-E8004, EC-E6002
  • Charging adapters: SM-BTE80, EW-CP100

This battery is not compatible with first-generation Shimano STEPS systems (E8000, E7000 series). Consult your frame manufacturer to confirm BT-EN805-L fitment before ordering.

Shimano offers a limited warranty covering defects in materials and workmanship. For warranty support, return the item to Tune Cycles.
  • 504Wh (36V, 14Ah) lithium-ion capacity for extended trail range
  • Second-generation integrated down tube / seat tube design — clean, stealth frame integration
  • Low centre of gravity for natural, balanced handling on technical terrain
  • Compatible with Shimano STEPS DU-EP801 and DU-EP600 drive units
  • IPX5 water resistance — handles rain and low-pressure washing
  • Full charge in approximately 5 hours with EC-E8004 or EC-E6002 charger
  • Retains over 60% of initial capacity after 1,000 full charge cycles
  • Weighs 3.15 kg
Capacity504 Wh
Voltage36 V
Ah Rating14 Ah
Weight3,150 g (3.15 kg)
Water ResistanceIPX5
Charge TimeApprox. 5 hours (EC-E8004 / EC-E6002)
Cycle Life>60% capacity retained after 1,000 full cycles
Operating Temperature-10°C to 50°C
Charging Temperature0°C to 40°C
Compatible Drive UnitsDU-EP801, DU-EP600
Compatible Battery MountsBM-EN800-A, BM-EN800-B, BM-EN801-A, BM-EN801-B
Compatible ChargersEC-E8004, EC-E6002
Compatible Charging AdaptersSM-BTE80, EW-CP100
ColourBlack
SKU SHM-IBTEN805LA
Barcode # 4550170234577
Brand Shimano

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