When 0 Isn’t 0

Why “zero current” doesn’t mean zero influence.

Applied Engineering Insight
Battery Technologies
Issue 01 / May 2026 · Martin Weiss

Battery test procedures often depend on rest periods, voltage relaxation, and open-circuit voltage observations. But in real systems, setting a bidirectional power supply to I = 0 does not always create a true rest condition.

This Applied Engineering Insight explains why “zero current” can still mean active equipment influence — and why that distinction matters for OCV, SOC mapping, relaxation behavior, and measurement validity.