This report summarizes key findings from EPRI reports Battery Energy Storage Installed Cost Estimation Tool (3002019154) and Battery Energy Storage Ongoing Cost Study & Estimating Tool (3002018500). This cost assessment focuses on lithium ion battery . . In this work we describe the development of cost and performance projections for utility-scale lithium-ion battery systems, with a focus on 4-hour duration systems. The projections are developed from an analysis of recent publications that include utility-scale storage costs. Department of Energy's (DOE) Energy Storage Grand Challenge is a comprehensive program that seeks to accelerate. . Energy Storage Cost Calculator is Aranca's proprietary decision-support tool designed to empower energy sector stakeholders with deep insights into storage technology economics. It enables realistic and accurate Levelized Cost of Storage (LCOS) calculations by integrating detailed technical and. . This article breaks down the economics, technical specs, and selection criteria for modern lithium storage systems without the fluff. When evaluating an energy storage system lithium battery, the first decision usually involves the chemistry of the cells.