busch+müller USB-Werk Mobile Charging Device - black/universal

busch+müller USB-Werk Mobile Charging Device

Item number: 35972
The USB-Werk is connected to the hub dynamo and makes the energy usable by delivering 5V voltage and up to 1A current. An integrated, small buffer battery ensures that the voltage supply remains at a constant 5V even at a slow pace and during short stops. The USB -Werk is therefore ideally suited for charging and operating all kinds of USB devices: mobile phones, GPS trackers, MP3 players, etc.

PLEASE NOTE: Information regarding charging with the USB WERK

To fully charge the buffer battery, which supplies the charging current and keeps it constant, you have to drive for about 20 minutes at a speed of over 17 km/h without a USB device connected - and with the lights off. Afterwards, the USB-WERK is optimally prepared within the scope of its possibilities for operating/charging a USB device.
It is not comparable to a normal mains charger for mobile devices; it supplies power to terminal equipment. When running applications, this can be enough to recharge the battery, while during high power consumption it may only be enough to slow down the discharging process. The higher the driving speed, the more charging current is potentially available. At slow speeds, the buffer battery can never recharge in charging mode, because the dynamo only provides limited energy (about 3 W at a speed of about 15 km/h). However, some mobile phones, consume up to 5 W. This means that the buffer battery is initially charged without power being made available via the USB output. As soon as a certain level of charge is reached, the USB output switches on. When the mobile phone empties the battery, the power supply via the USB output is switched off again at the minimum charge level, and the buffer battery is recharged again. This leads to interruptions, which some USB devices indicate with the 'charge start' sound.

In general, the E-WERK provides a higher power output than the USB-WERK, since the E-WERK does not have an integrated buffer battery that functions as a power storage unit. However, to charge some more sensitive mobile devices, E-WERK requires an additional, separate buffer battery to keep the power supply constant. This buffer battery is not suitable for connecting to the USB-WERK.

Information regarding the return of batteries and electrical equipment:

Information on the return and disposal of used batteries and electrical equipment can be found here.

Manufacturer Number:



  • 1 x busch+müller USB-Werk charger
  • 1 x connection cable for dynamo (80 cm)
  • 1 x round plug to USB socket cable
  • 2 x caps for plug socket
  • 1 x plug for Shimano dynamo hub
  • 2 x flat plugs with additional split for SON dynamo hub
  • 2 x shrink tubes for SON flat plug
  • 3 x rubber rings
  • 4 x zip ties

  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.85 / 5.00


  • black/universal, sold out

Customer Reviews (4)


Customer Reviews (4)


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by Stefano T. on 12.10.2016
1 of 1 customers found this review helpful.

I got this fine product twice and twice Bush+Muller replaced me in garantee (two years last). This tiny box is perfect for its dimensions and generally works fine. But after a period of inactivity i had to replace twice...This doen't mean the product is not good indeed... I'm going to
test the new item connected to dynamo to test its real performance on long period.

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