Bosch PowerMore 250 (smart system range extender): 250 Wh, 36 V, bottle-cage range extender. Which e-bikes it fits, the charge port it uses, and the drive systems it will not work with.
Updated 05 September 2026.
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Bosch PowerMore 250 (smart system range extender) (250 Wh, 36 V, BES3): specs and what it fits
What the Bosch PowerMore 250 (smart system range extender) measures, the drive system it belongs to, and the bikes it fits.
| Capacity | 250 Wh |
|---|---|
| Voltage | 36 V |
| Rated capacity | about 6.9 Ah |
| Form | bottle-cage range extender |
| Charge port | Bosch smart-system round charge port |
| Fits | Bosch smart system (BES3) bikes that support a range extender, mounted in the bottle-cage position |
Fits: Bosch smart system (BES3) bikes that support a range extender, mounted in the bottle-cage position.
The PowerMore 250 is a smart-system range extender, about the size of a bottle, that adds capacity to the main pack on supported BES3 bikes. It is a smart-system-only accessory and does not work on eBike System 2.
It charges through the Bosch smart-system round charge port.
Questions and answers
What is the capacity of the Bosch PowerMore 250 (smart system range extender) (250 Wh, 36 V, BES3)?
250 Wh
What is the voltage of the Bosch PowerMore 250 (smart system range extender) (250 Wh, 36 V, BES3)?
36 V
What is the rated capacity of the Bosch PowerMore 250 (smart system range extender) (250 Wh, 36 V, BES3)?
about 6.9 Ah
What is the form of the Bosch PowerMore 250 (smart system range extender) (250 Wh, 36 V, BES3)?
bottle-cage range extender