Boeing says roughly 100 Boeing 787 lithium-ion batteries have been returned to the company for service since deliveries began last year. Mike Sinnett, Boeing’s 787 chief project engineer, says the most common issue is over-discharge, a condition that can be hazardous for lithium-ion batteries and requires that the eight cells in the battery be scrapped. Sinnett, speaking at this week’s NTSB hearing on 787 battery problems in Washington on April 24, explained that in about two-thirds of ...


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