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Bosch eBike System 2 (BES2)Which replacement battery fits a Bosch eBike System 2 (BES2) bike?
The replacement batteries that fit a Bosch eBike System 2 (BES2) e-bike, and why another brand's pack will not work.
Fits with the right pack. A Bosch eBike System 2 (BES2) bike takes a Bosch battery proprietary to the system, so the replacement is one of its own packs, most often the Bosch PowerTube 625 (eBike System 2).
| Drive system | Bosch eBike System 2 (BES2) |
|---|---|
| Voltage | 36 V nominal |
| Replacement packs that fit | Bosch PowerTube 625 (eBike System 2) (625 Wh, 36 V, BES2); Bosch PowerTube 400 (eBike System 2) (400 Wh, 36 V, BES2); Bosch PowerPack 400 (eBike System 2) (400 Wh, 36 V, 11 Ah); Bosch PowerPack 500 (eBike System 2) (500 Wh, 36 V, 13.4 Ah); Bosch PowerPack 300 (eBike System 2) (300 Wh, 36 V, 8.2 Ah) |
| Charge port | Bosch smart-system round charge port |
| What will not fit | any battery from a different drive system, and packs from a different Bosch/Shimano generation |
A Bosch eBike System 2 (BES2) bike is powered by a Bosch drive, and the battery is proprietary to it. The replacement is one of the system's own packs: Bosch PowerTube 625 (eBike System 2) (625 Wh, 36 V, BES2); Bosch PowerTube 400 (eBike System 2) (400 Wh, 36 V, BES2); Bosch PowerPack 400 (eBike System 2) (400 Wh, 36 V, 11 Ah); Bosch PowerPack 500 (eBike System 2) (500 Wh, 36 V, 13.4 Ah); Bosch PowerPack 300 (eBike System 2) (300 Wh, 36 V, 8.2 Ah).
Bosch eBike System 2 covers the classic round-motor Bosch bikes from about 2014 to 2021. Its PowerPack and PowerTube packs use the oval charge port and are not interchangeable with the smart system. Do not buy a smart-system battery for a BES2 bike or the reverse.
Sources: Urban Arrow Service Center, Differences between Bosch eBike System 2 (BES2) and Smart System (BES3) · Propel Electric Bikes, Bosch PowerPack battery · Propel Electric Bikes, Bosch Standard Charger 4A eBike System 2 · Bosch eBike Systems, PowerTube and CompactTube batteries