What Are Stationary Batteries?

Stationary batteries are electrochemical energy storage systems installed in a fixed location and designed to supply reliable DC power to an electrical load or to exchange energy with an AC grid through an inverter. Unlike the batteries in portable devices or electric vehicles, stationary batteries are not required to minimize weight or volume; instead, the design priorities are cycle life, safety, total cost of ownership, and suitability for the specific discharge profile of the application. They underpin uninterruptible power supplies, telecommunications infrastructure, utility-scale energy storage, and emergency backup systems across industry.

Stationary battery installations range from small sealed lead-acid units in data centers to multi-megawatt-hour lithium-ion arrays connected to bulk transmission grids. The IEEE Power and Energy Society maintains a dedicated Energy Storage and Stationary Battery (ESSB) Committee, which develops and publishes the standards that govern their design, testing, and maintenance.

Battery Chemistry and Cell Types

Several electrochemical chemistries are used in stationary service, each offering a distinct balance among energy density, power density, cycle life, and cost. Vented lead-acid and valve-regulated lead-acid (VRLA) cells have been deployed in telecommunications and UPS applications for decades; they are low in cost but require periodic maintenance and have a relatively limited cycle life. Lithium-ion cells, in configurations based on lithium iron phosphate (LFP) or nickel manganese cobalt (NMC) cathodes, offer higher energy density and longer cycle life and have become the dominant choice for new grid-scale deployments. Vanadium redox flow batteries decouple power and energy by storing the electrolyte in external tanks, making them well suited to long-duration storage requirements. Sodium-sulfur and sodium-nickel chloride cells operate at elevated temperatures and are used in large industrial and grid applications.

Battery Management Systems

A battery management system (BMS) is an electronic system that monitors and protects each cell or module in a stationary battery, measuring voltage, current, and temperature while enforcing safe operating limits. The BMS also estimates the state of charge (SOC) and state of health (SOH) of the battery, information that the energy management system uses to dispatch the storage asset efficiently. Communication between the BMS and upstream control systems follows standardized information models to ensure interoperability.

In 2025, IEEE published IEEE Std 2686-2024, the Recommended Practice for Battery Management Systems in Stationary Energy Storage Applications, which establishes guidance on balancing methods, sensor placement, physical and software architectures, state-of-charge reporting accuracy, communication protocols, and cybersecurity practices for lithium-based, flow, sodium-based, and alkaline zinc-manganese cell types.

Safety and Standards

Stationary batteries store large quantities of electrochemical energy in confined spaces, so safety standards govern cell construction, enclosure design, thermal management, and fault protection. The IEEE ESSB Committee, whose scope covers safety, performance, and maintenance of energy storage and stationary battery systems, publishes standards including IEEE 1188 for VRLA batteries and IEEE 1187 for installation design. Thermal runaway, a chain reaction of exothermic reactions within a lithium-ion cell, is the principal safety hazard in modern stationary installations; the BMS plays a central role in detecting the early warning signs and isolating the affected module before propagation occurs. The IEEE 2030.2.1-2019 guide for design, operation, and maintenance of battery energy storage systems integrated with electric power systems provides complementary guidance covering both stationary and mobile installations. IEC 62619 and UL 9540A further specify abuse testing and fire-safety evaluation methodologies specific to stationary energy storage systems.

Applications

Stationary batteries have applications in a wide range of areas, including:

• Utility-scale grid energy storage for peak shaving and renewable integration
• Uninterruptible power supply (UPS) systems in data centers and hospitals
• Telecommunications backup power for cell towers and exchange equipment
• Frequency regulation and spinning reserve ancillary services
• Microgrids and off-grid electrification in remote communities