System downtime refers to the total time that the battery system is stopped from operating due to unplanned events (such as failures, anomalies, etc.) or planned maintenance. In the battery industry (especially in scenarios such as energy storage power stations, data center UPS, electric vehicles, etc.), the shorter the downtime, the higher the system availability and economic efficiency. Strategies to reduce downtime include: high-reliability component selection, redundant design (such as backup battery packs), fault prediction and early warning systems (such as SoH tracking), and quick repair and modular replacement design.