Whether you're managing a solar farm, grid-scale storage, or industrial backup systems, understanding battery replacement timelines helps minimize downtime. Battery swaps aren't one-size-fits-all. Replacing batteries in energy storage systems is like changing the heart of a power station—it needs precision, planning, and expertise. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or. Currently, a decommissioning plan is generally required as part of the permit application for a new BESS project. The stakeholder who builds the BESS (e., a BESS developer, a utility company, a municipality) will be held responsible for decommissioning and recycling the system at EOL. BESS technologies will support installations and businesses to overcome the. A dual-model battery health assessment framework analyzes real-world voltage data from retired EV batteries in grid storage. Using incremental capacity and probability density methods, it improves aging classification accuracy, supports strategic cell replacement, and enhances storage performance.