Pioneer in battery electronics and lasting repairs

Error code E3 points to a communication fault between the battery and the bike's motor controller.

The BMS (Battery Management System) blocks the battery as soon as it detects an irregularity. Often the battery itself is technically sound, but the internal protection logic stays locked.

KWS Seuren investigated this in depth and found that the fault was not in the cells or the software, but in the electronic control of the communication signal.

After extensive measuring and testing, KWS developed a hardware reset function that is built directly onto the battery's circuit board. The battery can be reset through a small hole in the casing, without taking it apart and without risk of damage. Since 3 November 2021, every Flyer and Gazelle battery repaired at KWS has been fitted with this permanent E3 solution as standard. Recurring faults are now a thing of the past, and the batteries often work more reliably than when they were new.

At KWS Seuren the work is not only about replacing cells or clearing error codes.

• The team gets to the bottom of every problem:
• Analysis of electronic components
• Measuring the communication between BMS, display and controller
• Developing in-house circuits and firmware modifications

This way of working has given KWS in-depth knowledge of battery electronics, from Flyer batteries to other e-bike systems and industrial applications.

“We want to understand why something goes wrong. Only then can you really fix it properly.”

KWS Seuren's expertise goes further than the Flyer E3 reset.

On other brands and systems, too, communication problems and electronics faults are solved for good, such as:

• Display communication (CAN and UART repair)
• Communication between motor and battery
• Charge indicators that show the wrong status
• Cell measurement and protection in the BMS

With this broad knowledge, KWS offers solutions that extend the life of batteries and make e-bike systems more reliable.

When KWS Seuren developed the E3 reset in 2021, no comparable method existed. Only later did other re-celling companies start to copy the technique. KWS remains the original developer and the reference in the market, because the solution comes out of its own research and documentation.

Because it was first, KWS is known today as a centre of knowledge on the electronics side of battery repair and cell replacement.

• First and original developer of the Flyer E3 reset (since 2021)
• A permanent solution instead of a temporary reset
• In-depth technical knowledge of electronics and communication
• High reliability and fewer warranty cases
• Can be applied to several brands and systems

This approach shows what a lasting fix needs: understanding the fault first, then precise workmanship.