Car repaired in 1-2 weeks in best case

Bronze: 5980 EUR (Warranty 1y/30 000km)

Silver: 7480 EUR (Warranty 2y/60 000km)

• Includes a maintenance check after 1y/30 000km

Gold: 8980 EUR (Warranty 3Y/90 000km)

• Includes a maintenance check after 1,5y/45 000km

Basic repair includes:

• Diagnostics
• Checking and repairing of battery modules
• Consumables and coolants
• Necessary battery rust repairs
• Transport to our workshop if necessary (charged separately)
• Quick check of rear drive unit for fluid leakage (valid only for large drive unit)
• Pressure/leak test
• Comprehensive repair report

By separate agreement:

• Exchange of contactors
• Battery case bottom dent repair
• Rental car 49 €/day (Tesla Model 3)

Before actually repairing the battery, the fault is diagnosed. In many cases we can do a preliminaty diagnostics remotely. It also helps us if a customer can check the vehicle alerts from the Service Mode menu and send us pictures. Sometimes the vehicle can also be ‘paralysed’ by other faults in the high-voltage system – for example, the engine, battery heater, air conditioning compressor or interior heater can cause an insulation resistance fault when it breaks down, preventing the car from starting. However, just by looking at the alarms on the car’s display, you can be fairly certain that the battery needs to be repaired. Fault codes such as BMS_a066, BMS_u029, BMS_u019, BMS_w017, BMS_f017, BMS_u018, BMS_f018, BMS_f123, BMS_u025 and BMS_f107 indicate battery failure. BMS_f151 refers to a fault outside the battery.

When a battery failure is found to be probable, the car’s data is recorded on a tester, the battery is disconnected from the car, the battery is opened, the fault is located and repaired. The repair involves a full visual and, if necessary, electrical inspection of the battery, and replacement or cleaning of critical battery sealing and “venting” components. If the repair requires the replacement of battery cells or modules, the new (used) cells are adapted to the original battery pack of the car. Corrosion of the battery case and cover are also repaired. The battery is assembled, pressure-tested, reinstalled in the car, and a test drive and charge to determine the success of the repair.

A typical cause of battery failure is moisture accumulation in the battery. Moisture accumulates both through condensation and through valves in the battery skirts. The valves become dirty in dusty conditions and start to let moisture into the battery – temperature fluctuations contribute to this. Sometimes moisture also enters through holes in the fuse cover that have rusted through, or through bolt holes through the battery cover. Moisture trapped inside the battery causes oxidation – for example, circuit boards inside the battery break down. We can repair or replace these circuit boards with intact ones. In rarer cases, the battery cells themselves are damaged, requiring the replacement of the entire battery module.

In the case of an LDU (Large Drive Unit), we also check the motor encoder, i.e. the sensor at the end of the motor. These engines have experienced internal coolant leakage and a wet sensor is a sign of an incipient problem. If the sensor is wet or the engine shows other signs of leakage, we recommend servicing the engine as soon as possible.

Under normal circumstances, a battery repair service takes about a week. If parts such as the battery module need to be replaced, depending on the stock situation and availability of parts, you should allow a few weeks for repair. Tesla, for example, will take one to two weeks to deliver new parts. During rush seasons the duration of the repair will be longer. The repair time estimate will be provided in the cost estimate.

The picture shows a badly oxidised battery module. Fortunately, this is a fairly rare occurrence.