Nissan Motor Co. plans to bolster the warranty of the battery modules in its electric Leafs to reassure consumers of their durability. The company intends to notify current owners and dealers early next year that it will make the warranty retroactive to cover all existing Leafs, offering to repair or replace the car’s lithium-ion battery if it loses more than 30 percent of its ability to hold a charge after five years or 60,000 miles.
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