Why battery technology matters for standby power in fire and security systems

Standby batteries keep fire alarms, emergency lighting and security systems operating during a mains power failure.

If the battery cannot maintain runtime required by standards (typically 24 hours standby + alarm operation), the system becomes non-compliant and protection is lost.

What is standby power?

Standby power is the built-in battery backup that automatically powers life-safety systems when mains electricity fails.

It allows systems to operate instantly with no reboot or interruption.

Standby batteries support:

• Fire alarm control panels

• Emergency lighting

• Intruder alarms

• Access control & door release

• Alarm signalling & monitoring equipment

How long must a firm alarm battery last?

Most UK and European standards require:

Mode	Required operation
Standby	~24 hours
Alarm condition	Additional alarm sounding time

If the battery cannot meet this duration, the installation is considered non-compliant even if it appears operational.

Why happens when standby power fails?

Battery degradation can cause protection loss during power cuts. Typical failures include:

• Alarms not sounding

• Detectors going offline

• Monitoring signals lost

• Doors failing to release safely

• CCTV recording stopping

In some cases, panels may still appear powered, meaning faults often remain hidden until an emergency.

Which battery type is best for fire and security systems?

Lead acid (VRLA/AGM)	Lithium ion phosphate (LiFePO₄)
Industry standard	Longer service life
Lower upfront cost	Stable voltage output
Sensitive to heat	Faster recharge after outage
Typical replacement: 3-5 years	Reduced maintenance visits

In modern installations, lithium improves reliability and lifetime compliance.

Why battery sizing and environment matter

Incorrect capacity is one of the most common inspection failures.

Issue	Results
Undersized battery	Early failure during outage
Excess heat	Rapid ageing
Poor quality battery	False faults & maintenance calls

Electrical risers and cupboards frequently shorten battery lifespan due to elevated temperatures.

Where standby power in fire and security is legally critical

Backup power is essential for:

• Fire alarm panels

• Emergency lighting

• Door release systems

• Intruder alarms

• Monitoring transmission equipment

If any stop during a power failure, both safety and compliance are compromised.

Why battery quality matters

Many fire and security faults are caused by degraded or poor-quality batteries rather than equipment failure. Using correctly specified standby batteries helps reduce maintenance visits, prevents nuisance warnings, maintains certification compliance and ensures systems operate reliably during emergencies.

DMS technologies supplies advanced standby power and battery solutions for fire, security and critical infrastructure environments, helping life-safety systems remain operational during power loss. For more information, contact sales@dmstech.co.uk or call 01794 525400.