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50KWh retired EV Battery Stack

50KWh retired EV Battery Stack

The Infinite Monkey Lab partnered with Community Energy Whāingaroa CEWh to develop and provide a 50kWh battery interface, equipment and services enabling optimal reuse of EOL EV batteries as BESS (Battery Energy Storage Systems from End-of-Life Electric Vehicles). 

The aim was to create a high-quality, high-safety, low-cost BESS through the reuse of complete EV batteries. Including software architected to be scalable to allow any size of BESS to be built with it.

These “second life” batteries provide a number of key environmental and economic advantages that fits with the Kaupapa of CEWh and XZWT over new commercial batteries, including:

  • A 30-50% lower carbon footprint, as they avoid raw material extraction and initial production.
  • Reduced demand for critical raw materials like lithium, cobalt, and nickel.
  • Extended battery life, reducing electronic waste and environmental pollution.
  • More affordability and increased availability for energy storage applications.


The 30kW/50kWh machine is a demonstration model using heavily degraded Leaf batteries. It is designed to be upgradeable to 10x this capacity. It is currently operational at a test location.