E-bike battery and BMS repair
Has your e-bike battery stopped charging, does the assistance cut out unexpectedly or has the range dropped sharply? Device Repair tests and repairs selected e-bike batteries, battery management systems (BMS) and their chargers. A new battery is expensive; often the cause is the BMS, a connector or a single cell group.
Common battery faults
- Battery does not charge or stops charging halfway
- Battery cuts out while riding, especially uphill or at full assistance
- Severely reduced capacity or range
- Voltage differences between cell groups
- BMS locks the battery or shows an error code
- Battery is not recognised by the display or motor
- Damaged contacts, wiring or charging socket
- Charger does not start or switches off immediately
E-bike battery testing
We measure the voltage of each cell group, behaviour under load and how the BMS responds. That shows whether repair, replacing a part or a new battery is the best option. A professional battery test can also be ordered separately in our online showroom.
Safety first
Lithium batteries store a lot of energy. Never send or bring a swollen, leaking, deformed, burnt, punctured, unusually hot or badly dropped battery, and do not use or charge it any further. Never ship an e-bike battery without our prior permission: lithium batteries are subject to special transport rules.
Diagnosis and decision
Our investigation may show that a repair is possible, not economical or unsafe. You are told in advance whether a diagnosis fee applies and you decide whether the repair goes ahead.
Frequently asked questions
Can an e-bike battery be repaired?
Often, yes. Many faults are in the BMS, wiring, contacts or a single cell group. Whether a repair is responsible depends on the brand, construction and condition of the cells.
What is a BMS?
The battery management system monitors charging, discharging, temperature and the balance between cells. A faulty BMS can lock an otherwise healthy battery completely.
Can I post my battery to you?
Only after our explicit confirmation and in line with the carrier's rules. A damaged or swollen battery must never be sent as a normal parcel.
Do you repair every brand?
We assess each brand, model and construction. We do not accept VanMoof or fat bike batteries.
Have your electronics assessed
Register the fault first with brand, model, error codes and photos. You will receive confirmation and instructions before you send or bring anything.
Submit a repair request ↗