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Bosch eBike System 2 (BES2)Does the Bosch PowerPack 400 (eBike System 2) fit a Bosch eBike System 2 (BES2) bike?
Whether the Bosch PowerPack 400 (eBike System 2) fits a Bosch eBike System 2 (BES2) e-bike, and what to confirm on your own frame first.
Yes, with the right mount. The Bosch PowerPack 400 (eBike System 2) is the native pack for a Bosch eBike System 2 (BES2) bike (400 Wh, 36 V), charged through the Bosch eBike System 2 oval charge port.
| Battery | Bosch PowerPack 400 (eBike System 2) (400 Wh, 36 V) |
|---|---|
| Native drive system | Bosch eBike System 2 (BES2) |
| Verdict | fits (native pack) |
| Charge port | Bosch eBike System 2 oval charge port |
| Will not fit | a different drive system, or a different Bosch/Shimano generation even if the shape matches |
The Bosch PowerPack 400 (eBike System 2) is proprietary to the Bosch eBike System 2 (BES2) drive, so it fits that system and no other. The PowerPack 400 is a 36 V 11 Ah external pack, about 2.5 kg, that charges in around 3.5 hours. The 400 and 500 frame PowerPacks are interchangeable, so a bike can be upgraded from 400 to 500 for more range.
Confirm the mount and the Bosch eBike System 2 oval charge port on your own frame, because packs that look identical across generations do not always interchange.
Sources: Bosch eBike Systems, PowerPack frame batteries · Propel Electric Bikes, Bosch PowerPack battery · Urban Arrow Service Center, Differences between Bosch eBike System 2 (BES2) and Smart System (BES3) · Propel Electric Bikes, Bosch Standard Charger 4A eBike System 2