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Bosch smart-system round charge port (BES3 round plug): pinout, rating and use
What the Bosch smart-system round charge port carries, how it is rated, and which e-bike systems use it.
Power panel
Voltage
36 V nominal pack
Connector data
| Pins / contacts | keyed round contact, smart-system specific |
|---|---|
| Current rating | 4 A on the standard smart-system charger |
| Voltage range | 36 V nominal pack |
| Locking | keyed round, smart-system only |
| Common uses | Bosch smart system (BES3) PowerTube, CompactTube, PowerPack and PowerMore batteries |
Common uses: Bosch smart system (BES3) PowerTube, CompactTube, PowerPack and PowerMore batteries. Systems: Bosch Smart System (BES3), Bosch eBike System 2 (BES2).
The Bosch smart-system charge port is a round plug distinct from the older BES2 oval port. A smart-system 4 A charger fills a PowerTube 750 in about six hours. A BES2 charger will physically connect differently and is not the right unit for a smart-system bike.
Systems and other connectors
Bosch Smart System (BES3)BES3, model year 2022 onBosch eBike System 2 (BES2)BES2, roughly 2014 to 2021XLR 3-pin charge connector3-pin locking, up to 16 ADC barrel (coaxial) charge connector5.5 x 2.1 or 5.5 x 2.5 mm
Sources: Clever Cycles, Bosch Standard Charger 4A Smart System ยท Bosch eBike Systems, Charger