Will the Shimano BT-EN405 battery (504 Wh, Gen.2) work with the Shimano DU-EP801 (EP8, Gen.2) drive unit?
Yes. Both use Shimano Gen.2 battery BT-EN404 / BT-EN405.
Both records are reviewed against the manufacturers' sources; sources last checked 2026-10-14. Informational only: confirm with the manufacturer before buying.
Why
- ✓ Both use Shimano Gen.2 battery BT-EN404 / BT-EN405.
Good to know
- Need a Gen.2 battery mount and Gen.2 drive unit (EP801/EP600/EP500).
- Shimano Gen.2 (BT-EN..., used with EP801/EP600/EP500) and 1st-generation (BT-E...) components: 'With some exceptions, first-generation and Gen.2 products ... are not compatible with each other.' Gen.2 batteries and mounts are marked 'Gen.2'.
- 'EP8' is used for both the DU-EP800 (1st gen) and DU-EP801 (Gen.2), and 'EP6' for DU-EP600 (Gen.2); check the drive-unit model number, not the marketing name.
- Shimano: 'It is recommended to use a SHIMANO genuine battery' and 'Use the specified battery and battery charger combination for charging.'
- The battery must also match the bike's battery mount and frame; Shimano's chart lists compatible mounts per battery. Watt-hours here are 36 V x the Ah Shimano states.
- Safety: use only batteries and chargers the drive-system maker approves. Lithium batteries that don't match can overheat.
Sources
- Shimano DU-EP801 (EP8, Gen.2) drive unit: specs from Shimano E-BIKE compatibility chart C-525 and EP801/EP600 user's manual, checked against the source 2026-10-13.
- Shimano BT-EN405 battery (504 Wh, Gen.2): specs from Shimano Special Battery and Parts user's manual (Gen.2) UM-7K10A-002 and compatibility chart C-511, checked against the source 2026-10-13.
- Shimano Gen.2 battery BT-EN404 / BT-EN405: Shimano Gen.2 batteries BT-EN404 (11.6 Ah) and BT-EN405 (14 Ah); the Gen.2 dealer manual pairs them with BM-EN400 mounts. (Shimano Gen.2 battery dealer's manual DM-BTE001-02).
Check your exact setup
Other parts in the cart, current configuration (installed memory, fan brackets) and adapters can change the answer.
Check a whole cartAlso checked with the Shimano DU-EP801 (EP8, Gen.2) drive unit
- Shimano BT-EN404 battery (418 Wh, Gen.2) Yes
- Shimano BT-EN604 battery (418 Wh, Gen.2) Yes
- Shimano BT-EN605 battery (504 Wh, Gen.2) Yes
- Shimano BT-EN606 battery (630 Wh, Gen.2) Yes
- Shimano BT-EN805 battery (504 Wh, Gen.2) Yes
- Shimano BT-EN806 battery (630 Wh, Gen.2) Yes
- Shimano EC-E6002 e-bike battery charger Yes
- Shimano EC-E8004 e-bike battery charger Yes
AI assistants and developers: the same answer, with a signed receipt, from check_compatibility at https://tetheredtrust.com/mcp or POST https://tetheredtrust.com/v1/check with existing_id: "shimano-du-ep801", candidate_id: "shimano-bt-en405".