Structure a battery formation yield problem using A3 current condition, target, gap, cause, countermeasure, and follow-up.
Formation yield fell from 96 percent to 91 percent across two shifts, but the cause is unclear. A3 path: background, current condition, target, gap, root cause, countermeasure, follow-up. The weak move is launching five fixes at once: retrain operators, change electrolyte hold time, inspect racks, adjust recipe, and call the software vendor. That may improve something, but it destroys learning because nobody can tell which action mattered. Before Formation yield is down. Multiple causes possible. Team to investigate and recover yield. After Current condition: Yield dropped from 96 percent to 91 percent on two aging racks after firmware update 4.8.…
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