Reuse of Electric vehicle batteries (Audi e-tron)

Project duration 05/2019 - Today
Status Active
Battery type reused Electric vehicles (Audi e-tron)
Location Karnataka & Uttar Pradesh (India), Ingolstadt (Germany)
Pilot partners Audi Environmental Foundation, Nunam
Contact people Darshan Virupaksha, Nunam (

Project description
With the support of the Audi Environmental Foundation, Nunam was also able to deploy a few prototype with used electric vehicle batteries from the Audi e-tron. Nunam has implemented 3x prototypes that run on used electric vehicle battery modules from prototype vehicles from the Audi e-tron (which was their first fully electric vehicle). These were batteries from pre-production vehicles which have been used in the vehicle development phase by Audi AG. The battery modules have been tested, characterised and integrated into an energy storage system (ESS) by Nunam in Bangalore, India. The purpose of these prototypes was to run more complex productive use applications that utilise the superior quality and performance of these battery modules. The local pilot implementation partners are The Energy and Resources Institute (TERI) and the Swami Vivekananda Youth Movement (SVYM).

There had been 3x second life prototypes deployed that run on Audi e-tron battery modules. Two technically identical smaller systems 5 (kWh) in India across two different locations (at a solar Nanogrid in Uttar Pradesh and another one used in a community center for a tribal community in the Indian state of Karnataka). The third prototype is a larger 20 kWh system deployed at a horticultural show (“Landesgartenschau”) in Ingolstadt, Germany.

Electric vehicle battery prototypes

Number of systems deployed


Total battery weight reused

102.4 Kg

Total battery capacity used

29.8 kWh

Total Co2 avoided by reuse

1538 Kg

Dashboards & Data


What went well?

The system design and development were smooth due to rugged design of the Audi e-tron modules. The quality of the cells found to be quite good for second life applications and we can expect long life in ESS applications. The end users have embraced the prototypes well due to the high energy density and sleek design. The Integrated design with its plug and play approach to connect DC loads and solar panels was well received.

What didn't go well?

The Telecommunication network challenges were persistent and alternates such as external outdoor antenna are being used.

Next Step?

Build larger systems to understand aging of the batteries better. Explore loads with higher and dynamic power requirements as compared to existing project