Part / accessory · Shimano

Shimano BT-EN404 battery (418 Wh, Gen.2)

verified 2026-10-13 Specs from Shimano Special Battery and Parts user's manual (Gen.2) UM-7K10A-002 and compatibility chart C-511. Also known as: bt-en404, bt-en404-a.

Specs

wh418
capacity ah11.6
voltage36
mountBM-EN400 mount
generationGen.2

Fits

  • e-bike battery 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.

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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.

What does the Shimano BT-EN404 battery (418 Wh, Gen.2) work with?

3 models in the graph.

Informational only. Confirm with the manufacturer before buying or installing. Spotted a mistake? Report it.