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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Recent outages underline two different parts of resilience: failures can begin far upstream of a facility, while tested backup systems can keep services running when grid power disappears. They also show why battery condition deserves ongoing attention—but the available evidence does not establish battery neglect as the cause of the North Hyde Substation outage.
What the North Hyde outage does—and does not—show
In its final review, published 1 July 2025, the National Energy System Operator (NESO) attributed the March 2025 North Hyde Substation incident to catastrophic failure of a high-voltage transformer bushing and the resulting fire at National Grid Electricity Transmission’s 275 kV substation. The incident affected Heathrow and other services. NESO reported that 66,919 domestic and commercial customers were directly supplied; all but two had their supply restored by 12:24 after North Hyde 66 kV was re-energised. NESO’s final review does not attribute the incident to battery maintenance.
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The report says three data centres lost grid supply but continued operating on backup generators. That is evidence that backup generation supported operations at those sites; it does not establish how their UPS batteries performed or whether battery condition contributed to the event. The distinction matters: an upstream grid failure can test a facility’s whole backup-power chain without being caused by any component inside it.
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Why power resilience remains a data-centre concern
Uptime Institute’s 2025 Annual Outage Analysis identifies power issues as the most common cause category for serious and severe data-centre outages. It also says failure to follow procedures became a greater contributor than in the prior year. These are findings about the outages covered by its analysis, not diagnoses of every infrastructure incident. Uptime Institute’s 2025 Annual Outage Analysis provides the sector-level context.
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In its 2025 Global Data Center Survey, Uptime Institute reports that power accounted for 45% of impactful outages in 2025. In separate 2025 resiliency-survey research cited in that report, respondents identified UPS failures (42%), transfer-switch failures (36%) and generator failures (28%) among causes of power-related IT service outages. These percentages refer to different component categories; they may overlap or be rounded and should not be added together. A UPS failure is not automatically a battery failure: UPS electronics, controls or other components can also fail. Uptime Institute’s 2025 survey report is the source for these figures.
Where batteries fit in the backup-power chain
A facility’s resilience depends on coordinated systems, not one battery bank. A UPS typically provides an immediate bridge when utility power is interrupted, while a generator can provide longer-duration power once it starts and connects. Transfer switches and controls help move loads between sources. The exact design varies, but a weakness in any element—or in the procedures used to operate and maintain it—can affect the overall response.
Batteries matter because their available capacity can diminish or become unreliable over time. Yet battery age alone is not a dependable universal replacement rule. Chemistry, equipment design, operating temperature, discharge history, maintenance requirements and measured condition all influence what action is appropriate. Facility operators should use the manufacturer’s instructions and applicable standards for their specific system.
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How stationary-battery maintenance is assessed
For stationary systems, Vertiv describes maintenance programs that combine inspection with electrical and performance checks. Its guidance discusses visual and mechanical inspections, checks of the operating environment, internal impedance or resistance measurements, load-bank or capacity testing, and infrared inspection. Such checks can help identify deterioration or operating problems that a simple age check would miss. Vertiv’s stationary-battery maintenance guidance also identifies high temperatures, corrosion, undercharging or overcharging, shorted or open cells, dryout and aging as factors that can affect battery life.
Vertiv’s summary of IEEE 450 and IEEE 1188 practices says replacement is recommended when capacity falls below 80% of the manufacturer rating. That threshold is guidance for the covered stationary battery types and standards, not a rule to apply automatically to every battery chemistry, consumer UPS or facility system. Confirm the applicable standard, battery type and manufacturer requirements before using a capacity threshold to plan replacement.
Testing without creating a backup gap
Testing is useful, but some tests can temporarily reduce the protection a battery system provides. Capacity tests and runtime calibration may discharge batteries; depending on the system and test plan, backup protection may be limited while the test is underway or the batteries recharge. The safe method depends on the equipment, load, redundancy and facility procedures.
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- AUTOMATIC VOLTAGE REGULATION (AVR): Corrects low voltage brownouts (88V+) and surges (+/-13%) without draining battery. Boosts or trims to stable 120V. Extends runtime for blackouts; Active PFC compatible for gaming PCs
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- Check the equipment manual and facility procedure before starting a test; do not assume a test is risk-free because it is automated.
- Confirm what the test will discharge, whether a redundant power path or bypass is available, and how the load will be protected during the test.
- Use qualified personnel for critical stationary systems, and record results so that trends can inform maintenance and replacement decisions.
Schneider Electric’s model-specific guidance emphasizes checking the exact device instructions, including before runtime calibration. A test sequence intended for one UPS should not be assumed appropriate for another. Schneider Electric’s Smart-UPS self-test FAQ describes its single-phase Smart-UPS context.
Small UPS batteries and facility battery banks are different jobs
Owners of a home or small-office UPS may be able to replace a compatible battery cartridge themselves if the product manual permits it. Identify the exact UPS model and confirm the specified replacement; a cartridge that physically fits is not necessarily the correct one. Schneider Electric provides model-specific UPS battery replacement guidance.
For its cited VRLA batteries, Schneider’s Smart-UPS FAQ gives a typical life of four to five years and notes that ambient temperature, discharge frequency and depth, and input power quality affect service life. Its broader safety guidance gives a typical range of two to five years and calls for a model-compatible replacement. These are vendor ranges for the referenced products, not a timetable to transfer to a large stationary battery installation. Schneider Electric’s battery safety guidance covers its product context.
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- ECO MODE: When the UPS detects a computer is off or in sleep mode, it will automatically turn off power to computer peripherals connected to ECO mode outlets, reducing power usage and lowering energy costs
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Commercial stationary systems require a different level of assessment: inspecting and testing the bank, managing risks to critical loads, planning replacement, and handling batteries safely. Facility operators should engage qualified stationary-battery professionals where their system and procedures require it. A consumer replacement cartridge is not a substitute for that work.
A practical way to judge a maintenance plan
When reviewing a UPS or battery maintenance approach, focus on the fit between the system’s needs and the evidence of its condition—not age or a generic replacement interval alone.
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- System and battery type: Identify chemistry, stationary versus consumer UPS use, manufacturer instructions and applicable standards.
- Condition evidence: Review inspection findings, alarms, impedance or resistance trends, self-test results and capacity-test results where applicable.
- Test risk: Establish whether testing discharges the bank or temporarily reduces backup protection, and what load, bypass or redundant-path conditions apply.
- Required runtime and criticality: Determine how long the system must support its load and what independent redundancy exists elsewhere in the power chain.
- Lifecycle and disposal: Consider age alongside temperature, discharge history, measured performance, replacement logistics and safe recycling or disposal.
- Provider scope: Match a small UPS’s model-specific cartridge instructions to that product; use qualified stationary-battery services for facility-scale systems.
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