48V Mild Hybrid Battery Vag 1.0 1.5 Tsi

The battery with original code 5WA915107 is a lithium-ion (Li-ion) module used in VAG group vehicles on the MQB Evo platform equipped with the mild hybrid 48 V system. The battery pack is intended to power the 48 V system that assists the combustion engine during starting, throttle release and energy recovery during braking.

Main technical data:

• Chemistry: Lithium-ion (Li-ion), NMC (Nickel-Manganese-Cobalt) type
• Nominal voltage: ~48 V (typical 12S configuration of 3.6–4.2 V per cell)
• Capacity: approximately 0.6 kWh (average estimate 12–14 Ah at 48 V)
• Peak current: >100 A for short periods, supports starting and regeneration
• Weight: about 10–12 kg
• Indicative dimensions: 35–40 cm (length), 15–18 cm (width), 8–12 cm (height)
• Cooling: passive (no liquid circuit), via natural dissipation
• Integrated BMS: Battery Management System built-in, with active balancing, diagnostics, HV disconnect and temperature sensors

The battery is located under the front passenger seat or in some cases under the rear bench, in a safe position protected from external elements. The housing is made of aluminum or fire-retardant plastic with insulated HV connectors.

DIPA recommends carrying out replacement at workshops equipped with appropriate diagnostic tools to avoid configuration issues.

Vehicle applications

Volkswagen

• Golf
• Golf Variant

Audi

• A3 Sportback
• A3

SEAT

• Leon
• Leon Sportstourer

Škoda

• Octavia
• Octavia Ocmbi

DIPA recommends always verifying the compatibility of the replacement part before purchase.

Maintenance and fault reporting

The 5WA915107 battery is designed to last the vehicle's entire lifecycle. However, it can malfunction in case of:

• Physical damage (impacts, ingress)
• Software error or defects in the BMS
• Cell deterioration due to overheating or abnormal deep cycling

Symptoms of failure include:

• Error messages “Starting disabled”
• Unexpected engine shutdown at low speeds
• Inability to activate energy recovery or start&stop
• Error codes detected in the 48 V control unit diagnosis

Conclusion

The OE 48 V battery 5WA915107 is a fundamental component of the VAG group's mild hybrid system, used on numerous models based on MQB Evo. Light, compact and integrated with a dedicated BMS, it provides effective support to improve efficiency, comfort and fuel economy.

DIPA is able to service these systems to restore their functionality. Thanks to the skill and experience of our technicians, we can refurbish the battery with significant cost savings compared to a new replacement and with positive environmental benefits, since a refurbished part is always more sustainable than a new one.