Most scenarios assume that Lithium batteries for EVs should be replaced
when they degrade to 70-80% of their initial capacities, after which they
might serve as storage batteries for the grid, or a house. Does anyone
know how low the capacity of a battery can fall before it is no longer
useful, and how long will that take? For example, can the capacity shrink
down to 15% and still provide useful power, and how long would that take?
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