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This article is about a demonstration unit set up by GM and ABB in which the used batteries from 5 Volts were repurposed for use in a neighborhood micro-grid setting.

http://www.greencarcongress.com/2012/11/gm-abb-20121115.html...

The modular air-cooled unit, which can provide about 25 kW of power for about 2 hours (50 kWh of energy capacity), is envisioned to be paired with a neighborhood transformer, said Dan Sowder from Duke Energy, which is putting one of the units into test. Duke supports about 4.2 customers per transformer
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