The grid storage market has been developing more slowly than many expected over the past several years. However, rapidly decreasing prices for lithium ion (Li-ion) batteries have opened new markets and revenue-generating opportunities for stationary storage systems. At the same time, advances in storage system software and controls are turning storage systems into highly flexible resources capable of providing a variety of services to system owners and grid operators. In these evolving markets, Li-ion is emerging as the go-to technology for many system developers due to an attractive combination of energy density, efficiency, warranties, and price points. The landscape of Li-ion battery manufacturers is diverse, with players ranging from small firms focused only on Li-ion technology to diversified, multinational corporations. Companies often specialize in one or more subchemistries of Li-ion, each of which has different operating characteristics and is better suited for certain applications on the grid. Leading companies offer solutions for various applications, including megawatt-scale utility systems and smaller, distributed systems for commercial and residential buildings. Distributed energy storage systems are gaining market traction and becoming an increasingly important part of the overall market due to a clearer business case and simpler engineering. This Navigant Research Leaderboard Report examines the strategy and execution of 15 leading Li-ion battery manufacturers that are active in the stationary energy storage market. These players are rated on 12 criteria: vision, go-to market strategy, partners, production strategy, technology, geographic reach, sales, marketing, and distribution, product performance, product quality and reliability, product portfolio, pricing, and staying power. Using Navigant Research?s proprietary Leaderboard methodology, vendors are profiled, rated, and ranked with the goal of providing industry participants with an objective assessment of these companies? relative strengths and weaknesses in the global Li-ion stationary storage market.