Field Perspective from Brennan Duffy

Why Telecom Standby Batteries Should Be Replaced Before They Fail

byAlamon/July 16, 2026/inDC Power Services News

If you have spent any time around communications networks, you already know this: everything works great — until it doesn’t.

I have been on sites where everything appeared to check out. Utility power looked stable. The standby batteries had “passed” inspection. On paper, the site looked ready.

Then the grid dropped.

What should have been a routine backup power event turned into a service-impacting outage because the batteries could not carry the load the way they were supposed to.

That is the challenge with standby batteries in a telecom environment. They usually do not fail loudly during inspections. They fail quietly over time — and the problem often does not reveal itself until the moment you need them most.

The Problem with “They’re Still Good”

A lot of operators have said some version of the same thing:

“The batteries are still working. We’ll replace them later.”

I understand the thinking. On the surface, delaying replacement can feel like a cost-saving decision. If the batteries are still present, still connected, and still showing acceptable readings, it is easy to move the project down the priority list.

But that can be misleading.

By the time standby batteries are clearly showing signs of failure, their performance may already be compromised. Capacity may be declining. Runtime may be shorter than expected. Internal resistance may be increasing. Aging cells may be creating uneven performance across the string.

And in the wrong conditions, a battery problem can become more than a runtime issue. Heat, aging infrastructure, poor ventilation, and deferred maintenance can increase the risk of serious battery-related failures.

The real question is not whether the batteries are still sitting there. The question is whether they will perform under load when the site actually needs them.

About the Author

Brennan Duffy is a telecom and critical infrastructure veteran with more than 25 years of experience in engineering, network operations, switching, data, and infrastructure leadership. Having worked with major communications providers including Verizon and Frontier Communications, Brennan brings a field-tested perspective on uptime, reliability, and the operational risks that can surface when standby systems are overlooked.

brennan.duffy@alamon.com
540.353.9022

What a Battery Failure Really Costs

When a telecom site loses backup power, it is rarely just a battery issue for long.

Now the operation may be dealing with emergency dispatches, overtime labor, SLA pressure, customer impact, escalation calls, truck rolls, and reputational damage. A preventable battery failure can quickly turn into a much larger operational problem.

That is why planned battery replacement should not be viewed only as a maintenance expense. In many cases, it is a risk-control decision.

Replacing batteries on a schedule gives an operator more control over cost, timing, labor, site access, and service continuity. Waiting for failure usually removes that control.

Why Telecom Sites Are Hard on Batteries

Telecom environments can be tough on standby batteries, especially in field locations.

Batteries may be exposed to heat inside cabinets or shelters. Power fluctuations can create repeated micro-cycling. Aging infrastructure may place uneven demand on backup systems. Maintenance records may be inconsistent across a large footprint of sites. In some cases, teams inherit battery plants without a clear picture of age, condition, or real-world performance.

Even when batteries appear acceptable during a routine check, the more important question is whether they can support the actual load for the required runtime during an outage.

That is where proactive testing, documentation, and replacement planning matter.

Replacement Should Be Planned, Not Reactive

When I work with customers, the goal is simple: eliminate surprises.

That means looking beyond surface readings and asking practical questions:

Are the batteries approaching the end of their service life?

Has runtime been verified under realistic conditions?

Are there signs of swelling, corrosion, heat exposure, or inconsistent cell performance?

Is the replacement schedule based on actual site conditions?

Are there sites where an outage would create especially high operational risk?

A good battery replacement strategy is not just about swapping hardware. It is about protecting uptime, reducing emergency calls, and making the network more predictable.

The Bottom Line

Standby batteries are easy to ignore because most of the time, they just sit there.

But when utility power drops, they become one of the most important components on the site.

You can replace them on your terms — with a plan, a schedule, and the right support.

Or you can deal with them on the worst possible day, under pressure, with customers waiting and service at risk.

I have seen both scenarios play out. One is controlled and cost-effective. The other never is.

If you are not sure where your sites stand, it is worth taking a closer look before the next outage makes the decision for you.

Not sure where your telecom sites stand? Alamon can help assess standby battery condition, replacement needs, and backup power readiness across your network.

Brennan Duffy
brennan.duffy@alamon.com
540.353.9022