E-WERK by Busch & Müller


For all those who do not want to go cycling without their mobile phones, GPS, MP3 players and other electronic devices and do not have access to a stationary charging station comes the "bike mobile" E-WERK. If the compact device is connected to the hub dynamo, the electricity generated by the cyclist's muscle power does not have to be used by only the lighting fixtures but can alternatively be processed by E-WERK. The energy is given off via two included connection cables that tinkerers can equip with plugs suited to their individual applications. Alternatively, the user employs an also included USB cable - the standard connection par excellence that offers compatibility with a wide range of devices - making sure that his electronic equipment does not run out of power while he is on the way. A small stylus that is housed at the bottom of E-WERK is used for adjusting two turning knobs controlling voltage (2.8 to 13.3 V) and current (0.1 to 1,5 A) quickly and variably for all the usual applications. E-WERK provides power of up to 16 W, and all that with idle losses of only 0.03 W at 30 km/h! At a speed of 15 km/h, E-WERK already charges as fast as a standard mains connected charger. An extension cable offers the possibility to tap into E-WERK's energy supply at virtually every spot on the bike. Cable screw connections keep the all links securely water tight. In order to mount the "miniature powerhouse" on the bicycle frame, three differently sized o-rings and cable straps are included.

Some devices, such as Garmin GPS units, require a constant voltage from the charger. For devices like this, an intermediary or buffer cache battery must be used. The E-WERK will charge the battery, which then charges the device. The Busch & Müller cache battery, part # B&M461A) can be charged by the E-WERK while simultaneously charging the device.


A wide range of connectors are included with the E-WERK, so you should be able to connect whatever device you want.

I'll have photos of the E-WERK mounted on my bike soon. For now, you can download the User Manual.

When you get your E-WERK, it is imperative that you resist the overwhelming desire to throw it on the bike, connect your device to be charged, and head out on a ride. You MUST read the manual first. You must properly set the voltage and amperage for the device to be charged. And if you will be using the E-WERK to charge more than one device, you must not forget to properly re-adjust the voltage and amperage settings for the new device.

The E-WERK is compatible with most devices. Some devices will shut off if the incoming power stops, as in when your bike stops at a traffic light. Busch & Müller makes a cache battery for use with devices requiring constant voltage. This will act as a buffer between the E-WERK and the device in question. Use the E-WERK to charge the small cache battery, and the battery will then charge the device at a constant 5 volts. And all this can happen simultaneously.

If your bike has a dynamo powered headlight, it must be switched off while charging your phone or GPS via the E-WERK.

Please click this link to download the E-WERK manual. It explains how the E-WERK functions in great detail.


The E-WERK price was $250. We now have a close-out price of $150.

Please don't use the E-WERK with the 1.5 or 2.4 watt dynamo hubs you sometimes see for sale. These are very cheap, low power hubs which only exist to satisfy the minimum requirements for bicycle lights in Germany, and are generally used by people who never ride at night but must still have functioning lights in order to avoid a ticket in the middle of the day. Duh!

E-WERK Cache Battery

Some devices cannot simultaneously run and be charged directly from the E-WERK, but instead must be charged by another battery. This is because they will shut off if the input power drops below a certain level. The cache battery provides a constant power output to your device, so the device will continue to run, and/or charge, while you ride, regardles of your speed. When you stop, the E-WERK is no longer providing output, but the cache battery continues as long as it has a charge.

Capacity: 1400mAh

E-WERK Cache Battery, In Stock. Price: $60.00

Charge the E-WERK Cache Battery from 120v AC

The Cache Battery is normally charged from the E-WERK. But, what if you want to start your ride with a fully charged Cache Battery? You can do it with the battery charger for the Busch & Müller Ixon IQ Speed headlight, and a special cable. The Ixon IQ Speed charger has two power settings, and to charge the Cache Battery, you must only use the low power setting on the charger.

Ixon IQ Speed battery charger, Part # B&M4473: $ 50.00

Special cable needed for charging Cache Battery, Part # B&M461A44731: $ 10.50

Cinq Power Pack II

The Cinq Power Pack II is made by Tout Terrain in Germany. It is a compact but powerful battery that can be charged by the E-WERK while you ride or by any USB outlet while you sleep. It outputs via USB keeping your Garmin or mobile phone charged while you ride.

Set the E-WERK to output 5 volts and .5 amps to charge the Cinq Power Pack II.

Capacity 3000mAh

Cinq Power Pack II, Part # TOU623-001-001, Price: $ 157.00

See full details about the Cinq Power Pack II on this page.

Need a Spare Cable?

E-WERK Output to bare wire ends, for making custom cable, Part # B&M461KF-1:$ 11.00

E-WERK Output to female USB, Part # B&M461KUSBB: $ 10.50

E-WERK Output to USB Micro, Part # B&M461KMIC: $ 10.50

E-WERK Output to USB Mini, Part # B&M461KMIN: $ 12.50

Standard male USB to USB Micro, Part # B&M461KUSBMIC: $ 10.50

Standard male USB to USB Mini, Part # B&M461KUSBMIN: $ 10.50

E-WERK Output to E-WERK Input, It's a 1000mm extension cable, Part # B&M461KV-1: $ 12.00

E-WERK Input to Bare Wires, for connecting to the Dynamo, Part # B&M461KD-1: $ 12.00


Dealer Inquiries Invited, call: 603 478 0900


Some GPS users report that their device won't run while charging from the E-WERK. We believe that this only happens on certain models when you use either the Micro USB or Mini USB connector attached directly to the output of the E-WERK. However, the E-WERK also ships with a standard USB connector, as well as standard USB to Micro and standard USB to Mini cables. So, if you find that your GPS won't run while charging from the E-WERK, try using the standard USB cable, and then the standard USB to Micro or Mini (whichever your device requires) cable provided with the E-WERK. Then, you should be able to charge from the E-WERK while you ride and have full use of the GPS device.


Most devices that charge via USB need .5 amps. Some devices require more amperage to charge than others. And hub dynamos have only so much amperage to give. If your device requires 1 amp, your hub dynamo won't be able to charge it. You should check the specifications on your device and determine that the input amperage is below 1 amp before buying the E-WERK. Having a cache battery will give you more run time, but eventually the draw from your device will be greater than the hub's ability to charge the cache battery.

Universal Cockpit Adapter


A handlebar mount for holding the device you charge with the E-WERK is also available. The Universal Cockpit Adapter mounts easily to the handlebar without tools. Thick cellular rubber coating on all contact areas of the holder cushions shocks and prevents scratches even on the most sensitive surface. The adapter opens gently upon pressing the rear release button. The holder's inclination can be adjusted variably, thereby offering optimal visibility for every kind of display. An opening at the bottom of the adapter provides enough space to connect cables, so that power supply for inserted devices is ensured at all times, e.g. from the revolutionary E-WERK charger.

with iPhone

Universal Cockpit Adapter: $ 16.00

Dealer Inquiries Invited, call: 603 478 0900

Remember that while the E-WERK can be used in all weather, your electronic device might not be weather proof.

If you have a current Busch & Müller battery light, such as the Ixon, Ixon IQ, Ixon Speed, Ixon IQ Speed or Big Bang, you can use the E-WERK to charge its battery. With the Ixon or Ixon IQ, you plug the output of the E-WERK directly into the charging plug on the underside of the Ixon. With the Speed series headlight, you plug the E-WERK's output into one of the battery leads, and the headlight into the other battery lead. If you normally use two Ixon Speed headlights connected to the one battery, you'll only be able to use a single headlight while charging with the E-WERK. See the PDF for all the details.

Which hub dynamo to use?

Most dynamo hubs are designed for use with 700c rims. This includes all of the Shimano hubs, the Sanyo hubs, and SRAM models, and all of the various Schmidt dynamo hubs with "28" in the name. In accord with German law, when used with a halogen bulb headlight, the system produces a very bright light by 5mph. Schmidt also makes a variety of hubs for smaller wheels, like the SONdelux, SONXS and SONXS100.

It's becoming popular among night riders using 26" or 700c wheels to use one of the Schmidt hub dynamos designed for small wheels such as the Schmidt SONXS100 or SONdelux. When you use one of these hubs with a larger rim, the hub is rotating at a slower rate than it would be if used with a 20" wheel, when riding at any given speed. The slower the hub rotates, the less power it delivers, and the less drag there is. With the new LED headlights, you can still get a very bright light at a low speed, lower than you would with a halogen bulb headlight. This results in slightly lower drag, because the hub is generating less power. But the LEDs need less power than a halogen bulb, so it works.

But what if you want to use the hub's output to charge a battery as well? If you use a hub designed for a 20" rim but instead use a 700c rim, at any given speed, you'll have less power available for charging a battery, because the hub is rotating at a slower rate than it normally would at that speed. It will still work, but the charging time will increase a bit. So if you're going to use the E-WERK, or think you might in the future, you may want to think twice about how important that small difference in drag is to you. The drag of a SON28 hub with a 700c rim is tiny. So a SONdelux hub with a 700c rim is a little less than tiny. Do you care? Should you care? If you know for certain that the E-WERK isn't for you, pick your dynamo hub based on quality, performance and price only.

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This page updated: Tuesday, February 18, 2020

Peter White Cycles LLC
24 Hall Rd.
Hillsborough, NH 03244
603 478 0900 Phone