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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Lithium-ion batteries in data-center uninterruptible power supply (UPS) systems can turn a cell failure into a fire, a threat to responders and a service outage. But the available evidence does not show that battery rooms are the biggest threat to data centers overall. It does show why battery-system design, testing and emergency planning deserve close attention.
What happens when a UPS battery enters thermal runaway?
Thermal runaway is an uncontrolled self-heating failure in a lithium-ion cell. Heat and gases released by a failing cell can ignite, and under some conditions the failure can spread to nearby cells or battery modules. The resulting hazards can include intense heat, smoke, hazardous vent gases and, in some incidents, fire or explosion.
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Propagation is not inevitable: it depends on factors including the system design, spacing, enclosure, cooling and conditions of the failure. FM’s 2026 technical report describes both propagation and a later test in which design changes limited it. That is evidence about the system and test conditions studied, not a failure rate for data centers or a prediction for every UPS.
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What did the large-scale UPS tests show?
FM, Delta Electronics and Equinix evaluated a Delta lithium-ion UPS battery system in two phases. The results show why a product-level compliance result alone may not establish how a complete installed system will behave in a fire scenario.
#1 Best Overall
- [LiFePO4 Battery, Ultra-long Endurance]: This lithium UPS is equipped with a state-of-the-art Lithium Iron Phosphate Battery Pack, delivering a lifespan of over 10 years and more than 5000 charge cycles. Compared to traditional lead-acid battery solutions, it offers a total cost of ownership (TCO) that is more than 40% lower. The advanced battery technology not only ensures long-lasting performance but also providing a cost-effective and reliable power backup solution
- [Multi-Outlets & Efficient Cooling System]: Featuring eight NEMA 5-15P outlets with both surge protection and battery backup, this plug-and-play device comes with an AC power cord. It also includes a built-in Battery Management System (BMS) and PP45 terminals for safe and reliable connections.The advanced BMS works efficiently with cooling system.The newly updated cooling fan operates at a noise level below 50 dB. Note: The high-power cooling fan will activate when the BMS detects heavy battery usage
- [Trustworthy Protections]: The 1000VA/800W Pure Sine Wave Battery Backup Uninterruptible Power Supply (UPS) System continuously monitors battery voltage, ensuring high efficiency and reliability. It effectively addresses common electrical issues like power outages, high/low voltage, voltage drops, shocks, high voltage pulses, voltage fluctuations, and surges. This system is perfect for supporting computers, workstations, network devices, and telecom equipment
- [Intelligent LCD Panel]: This UPS provides real-time, detailed information on battery and power conditions, ensuring optimal performance and reliability. It features an automatic safety mechanism that halts charging and discharging if limits are exceeded, preventing potential damage. This not only protects the system from overloading and overheating but also significantly extends the UPS's lifespan, ensuring long-term, dependable operation
- [Professional UPS with Certifications]: Our UPS battery backup has successfully passed rigorous safety certifications, ensuring compliance with the highest industry standards. It incorporates the leading chip technology in the industry, providing double anomaly protection for enhanced safety and reliability. Additionally, the system offers a maintenance-free operation for up to 10 years, guaranteeing peace of mind and long-term dependability
| Test | Observed result | What it establishes |
|---|---|---|
| Phase I, original configuration | In FM’s 2026 test, intentional ignition of thermal-runaway vent gases produced a peak heat-release rate of approximately 700 kW. The report says propagation could cross adjacent units. Sprinklers activated, but the enclosure restricted water access and cooling; adjacent module surfaces exceeded 500 °F (260 °C), the report’s stated safety-venting temperature. | The tested configuration failed this fire test despite having previously shown UL 9540A compliance. |
| Phase II, modified configuration | After changes intended to reduce heat transfer to adjacent modules and improve sprinkler cooling, the repeat test confined thermal runaway to the initiating module. Neighboring module surfaces stayed below 212 °F (100 °C). | The modified configuration passed that test. It does not establish how other products or installations will perform. |
The practical lesson is to ask what was tested and how closely the test configuration matches the proposed installation. A test result should be read with its scope, system design and scenario in view—not treated as a universal guarantee.
Can a battery-room fire cause a data-center outage?
Yes. A fire can threaten service even if the initial failure is confined to backup equipment: smoke, heat, firefighting activity or a building closure may affect access and operations. A September 2025 South Korean government-run data-center fire illustrates the continuity risk. UL Solutions reported that the closure disrupted 647 public systems. That figure is UL’s account; a primary government incident report was not available to independently verify it here.
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This incident supports the point that a battery fire can have consequences beyond the battery room. It does not establish that battery fires are the leading cause of data-center outages. The available evidence does not provide a data-center-wide comparison of outage causes.
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Detection, ventilation, suppression, physical separation and responder planning need to work as a coordinated system. A detector or extinguisher by itself cannot make a room safe or guarantee that a fire will be controlled. Room design and response plans should be reviewed by qualified fire-protection and electrical professionals with the local authority having jurisdiction (AHJ).
Rank #3
- [LiFePO4 Battery, Ultra-long Endurance]: This lithium UPS features a cutting-edge Lithium Iron Phosphate Battery, offering a lifespan of over 10 years and 5000+ charge cycles. It reduces total cost of ownership by over 40% compared to traditional lead-acid batteries, ensuring reliable, long-lasting performance without frequent replacements
- [Multi-Outlets & Efficient Cooling System]: This plug-and-play device includes eight NEMA 5-15P outlets with surge protection, an AC power cord, and PP45 terminals for secure connections. The built-in Battery Management System (BMS) ensures safe operation, working efficiently with a low-noise cooling fan (under 50 dB). Note: The fan activates during heavy battery usage
- [Trustworthy Protections]: The 1000VA/600W Pure Sine Wave UPS ensures high efficiency by continuously monitoring battery voltage. It protects against power outages, voltage fluctuations, surges, and more, making it ideal for computers, workstations, network devices, and telecom equipment. [Safety Notice]: Use only the original or fully compatible power cable. Do not use the device in high-temperature or enclosed areas. Keep the connected load within the rated 600W capacity. Discontinue use immediately and contact us if any abnormality occurs (e.g. swelling or unusual noise)
- [Intelligent LCD Panel]: This UPS offers real-time monitoring of battery and power conditions for optimal performance. Its automatic safety mechanism stops charging and discharging if limits are exceeded, preventing damage, avoiding overloads, and extending the UPS's lifespan
- [Professional UPS with Certifications]: Our UPS battery backup has successfully passed rigorous safety certifications, ensuring compliance with the highest industry standards. It uses advanced chip technology for double anomaly protection, ensuring safety and reliability. The system offers maintenance-free operation for up to 10 years, ensuring long-term dependability
Detect abnormal conditions and connect alarms to action
The International Telecommunication Union’s 2025 white paper on lithium-ion batteries in data centres discusses automatic fire detection and combustible-gas detection in battery rooms. It describes linking gas detection with ventilation and alarms, and also addresses detector positioning, calibration and other detection approaches, including thermal imaging. The appropriate equipment and placement depend on the system and room design; this guidance is not a recommendation for a standalone consumer detector.
Design for cooling and separation
FM’s UPS tests demonstrate why engineers should evaluate heat transfer between modules, spacing and whether sprinkler water can reach the areas that need cooling. The enclosure in the Phase I test restricted water access, while modifications to improve cooling and reduce heat transfer helped limit propagation in Phase II. The result supports installation-specific assessment, not a blanket claim that a particular suppression arrangement will work in every battery room.
Rank #4
- [LiFePO4 Battery & Ultra-Long Endurance]: This UPS features a cutting-edge Lithium Iron Phosphate (LiFePO4) battery pack (25.6V, 3Ah) with over 10 years of lifespan and 3,000+ charge cycles. Compared to traditional lead-acid batteries, it reduces total cost of ownership by 40% and delivers reliable, long-lasting performance. Maintenance-free and replacement-free, the LiFePO4 technology offers a smarter, hassle-free, and cost-effective backup power solution (Note: The LiFePO4 battery does not require replacement or any other hassle maintenance like Lead-acid battery)
- [Important Notice]: This 600VA/360W Lithium UPS is an uninterruptible power supply with a 76.8Wh internal backup battery, not a portable power station or high-capacity backup power product (which typically exceeds 1000Wh). A UPS is designed to protect connected devices and provide short-term runtime during power outages or electrical surges. For normal operation, the UPS must remain continuously connected to utility power, which simultaneously supplies power to your equipment and charges the internal battery. In the event of a power failure, the UPS will automatically and instantly switch to battery power to keep your devices running without interruption
- [Compact Standby UPS]: The GOLDENMATE 600VA/360W simulated sine wave standby Uninterruptible Power Supply (UPS) is thoughtfully crafted with a sleek, space-saving design that blends seamlessly into any modern workspace. Its compact size (280 × 116 × 112 mm) and lightweight build (just 2.1 kg) make it effortless to place on your desk or mount elegantly on a wall with the included screws. Beyond its refined design, it supports your lifestyle by keeping essential devices powered during outages — from desktop computers and routers to wireless gateways, smartphones, and tablets — ensuring you stay connected, productive, and worry-free at all times
- [Multi-Outlets & Wireless Charging Panel]: This UPS is designed with six power outlets, each equipped with surge protection and seamlessly connected to the backup battery to keep your essential devices running without interruption. The outlets feature a user-friendly layout with generous spacing, making it effortless to plug in devices of different sizes. Adding to its versatility, the UPS also integrates a 15W wireless fast-charging panel, providing a convenient way to power your smartphone, smartwatch, and other personal electronics — whether in daily use or during unexpected outages (Note: Click the power button to turn the wireless charging module on/off)
- [Communication Port & USB Charging]: The newly launched 600VA/360W model comes equipped with enhanced connectivity, including a communication port with a dedicated USB cable and dual USB charging ports. When connected to a Windows PC, the UPS can be configured to automatically initiate a safe system shutdown via Windows settings, providing added protection for your data. It also features two versatile USB charging options — one Type-C and one Type-A — delivering a combined 10W output to conveniently power your everyday devices such as smartphones, tablets, and smartwatches
Plan for responders and post-incident hazards
UL Solutions advises facilities to establish an emergency plan, pre-plan with the local fire department and restrict firefighting attempts to trained, qualified personnel. Its safety guidance warns that extinguishers will not fully extinguish a lithium-ion battery fire once thermal runaway begins. Water may help cool adjacent cells and limit spread, but that is not a general instruction for untrained staff to fight a battery fire. Follow the site emergency plan and qualified responders’ direction.
EPA guidance on battery energy storage systems (BESS) also emphasizes difficult suppression, harmful emissions, specialized cleanup and disposal, remote monitoring and incident-response planning. That is broader energy-storage guidance, not a data-center UPS code requirement. A BESS can differ substantially from an indoor UPS battery room in scale, layout and operating context. For example, UL’s Fire Safety Research Institute investigated a 2020 deflagration involving a 2.16 MWh energy-storage facility in Surprise, Arizona; that was a BESS incident, not a data-center UPS test.
Best Value
- [Multi-Outlets & Efficient Cooling System]: Featuring eight NEMA 5-15P outlets with both surge protection and battery backup, this plug-and-play device comes with an AC power cord. It also includes a built-in Battery Management System (BMS) and PP45 terminals for safe and reliable connections.The advanced BMS works efficiently with cooling system.The newly updated cooling fan operates at a noise level below 50 dB. Note: The high-power cooling fan will activate when the BMS detects heavy battery usage
- [LiFePO4 Battery, Ultra-long Endurance]: This lithium UPS is equipped with a state-of-the-art Lithium Iron Phosphate Battery Pack, delivering a lifespan of over 10 years and more than 5000 charge cycles. Compared to traditional lead-acid battery solutions, it offers a total cost of ownership (TCO) that is more than 40% lower. The advanced battery technology not only ensures long-lasting performance but also providing a cost-effective and reliable power backup solution
- [Trustworthy Protections]: The 1000VA/800W Pure Sine Wave Battery Backup Uninterruptible Power Supply (UPS) System continuously monitors battery voltage, ensuring high efficiency and reliability. It effectively addresses common electrical issues like power outages, high/low voltage, voltage drops, shocks, high voltage pulses, voltage fluctuations, and surges. This system is perfect for supporting computers, workstations, network devices, and telecom equipment
- [Professional UPS with Certifications]: Our UPS battery backup has successfully passed rigorous safety certifications, ensuring compliance with the highest industry standards. It incorporates the leading chip technology in the industry, providing double anomaly protection for enhanced safety and reliability. Additionally, the system offers a maintenance-free operation for up to 10 years, guaranteeing peace of mind and long-term dependability
- [Intelligent LCD Panel]: This UPS provides real-time, detailed information on battery and power conditions, ensuring optimal performance and reliability. It features an automatic safety mechanism that halts charging and discharging if limits are exceeded, preventing potential damage. This not only protects the system from overloading and overheating but also significantly extends the UPS's lifespan, ensuring long-term, dependable operation
What standards and test records should facility teams check?
Three references serve different purposes, according to UL Solutions: UL 9540 is a product safety standard, UL 9540A is a fire-propagation test method, and NFPA 855 provides installation guidance for stationary energy-storage systems. Meeting one test or standard should not be confused with approval of every room layout, system configuration or local installation.
UL Solutions says the 2026 edition of NFPA 855 adds installation-level large-scale fire-testing guidance. It also says UL 9540A edition 6 introduces a more challenging installation-level fire scenario and has an effective date of January 1, 2027. Standards and local code adoption can change; confirm the edition and requirements applicable to the project’s jurisdiction and installation date with the AHJ.
When reviewing a UPS proposal or existing installation, ask for documentation that addresses:
- The battery chemistry and system configuration being evaluated.
- Which test levels are covered—cell, module, unit or installation—and which UL 9540A edition was used.
- Observed propagation behavior and the spacing or separation assumptions behind the result.
- Whether sprinklers or other suppression can reach the relevant surfaces and provide effective cooling.
- How gas detection, ventilation and alarms are integrated and maintained.
- Emergency shutdown, responder access, the site response plan and local code approval.
These are review questions, not a substitute for a project-specific engineering assessment. A test report is most useful when its configuration and conditions can be compared with the equipment and room actually being installed.
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