They already did that. Their battery does not have a thermal management system like their competitors do, and so it gets damaged during heavy use or temperature

They already did that. Their battery does not have a thermal management system like their competitors do, and so it gets damaged during heavy use or temperature fluctuations. It loses capacity rapidly and must be replaced after 5 years or so if the owner would like to keep a reasonable driving range. Therefore they need to figure out what to do with these bad battery packs, and as the article states they can use it to power street lights as it won't work for the car anymore. I'd recommend searching for other articles about the Nissan Leaf battery to get a better understanding of the situation.