How long does an industrial battery last?

Design life ranges from 5 years for economy VRLA to 20 years for OPzS. Real service life is usually shorter, because every 10 degrees Celsius above 20 degrees roughly halves lead acid life. Temperature control matters more than brand.

What is the difference between kW and kWh?

kW is power, how much the battery can deliver at any instant, and it decides which appliances or loads can run at all. kWh is energy, how much it holds in total, and it decides how long they run. A system can have enough energy and still trip on power, or plenty of power and run out in minutes.

When is a battery considered end of life?

The standard threshold is 80 percent of rated capacity, confirmed by a load bank discharge test. Below that, capacity falls quickly and autonomy becomes unpredictable, so replacement is planned rather than reactive.

Can lithium and lead acid be mixed in one string?

No. Charge voltages, internal resistance, and management requirements differ, and the weaker chemistry is driven outside its window. Replace a string as a set, with matched cells of the same age and type.

Is lithium always the better choice now?

No. Lithium wins where space is tight, temperatures are high, or the system cycles daily. For a substation DC system that discharges rarely and must last twenty years, flooded lead acid is often still the more rational asset. The duty profile decides, not the trend.

What happens to batteries at the end of life?

They are collected, palletised, and transported to certified recyclers under a documented chain of custody. Lead acid is one of the most recycled products in the world, and lithium recovery is scaling. EXBATT arranges collection, transport, and disposal documentation, and hands over to certified third party recyclers.

All insightsInsight

What is a battery, and why is it everywhere?

14 min readLast reviewed: August 2026

Short answer

A battery is a device that stores energy in chemical form and releases it as direct current electricity on demand. That single property, holding energy until the moment it is needed, is why batteries sit behind almost every service that is not allowed to stop. An industrial battery is the same idea built for years of standby or daily deep cycling, rated in ampere hours at a defined discharge rate rather than in starting current.

Electricity has one awkward property: it is produced and consumed in the same instant. The battery is our answer to that, and it is the reason mobile networks, hospitals, substations, data halls, and homes keep working through the seconds when the grid does not. This is a long read on what a battery actually is, why it became so useful, and what we have learned specifying them across the Western Balkans.

01 | HOW A BATTERY WORKS

A battery stores electricity as a chemical state, then returns it as current when the timing suits you.

The problem batteries solve

Almost every other resource we depend on can be stockpiled. Water sits in a reservoir, grain sits in a silo, fuel sits in a tank. Electricity does not behave that way. On a wire, generation and consumption must match continuously, second by second, or voltage and frequency drift and equipment starts to fail. Everything difficult about power systems follows from that one fact. A battery breaks the rule by converting electricity into a chemical state that can wait, then converting it back when the timing suits us instead of the grid. That is the whole idea, and it is why a technology invented for laboratory experiments now underpins critical infrastructure.

What is actually happening inside

Every battery, from a coin cell to a forty foot storage container, is built from the same three parts: two electrodes made of materials that want to exchange electrons, and an electrolyte between them that lets ions move but blocks electrons. When you close an external circuit, the only route the electrons can take is through your load. Chemistry pushes, the load consumes, and the reaction runs until the active material at one electrode is depleted. In a rechargeable battery, an external voltage drives that same reaction backwards and rebuilds the active material. Nothing about it is magic, and nothing about it is free: every cycle leaves the plates slightly less perfect than before, which is why ageing is a design parameter and not a defect.

Why they ended up everywhere

Batteries won not because they are efficient in an absolute sense, but because they are silent, instant, modular, and indifferent to location. There are no moving parts, so there is nothing to warm up: a battery answers a load in milliseconds, which is exactly the window in which a mobile core network or a hospital theatre cannot tolerate darkness. They scale by repetition rather than redesign, so the same cell chemistry serves a 48 V telecom rack and a multi megawatt grid asset. They need no fuel logistics, no chimney, and no permit for noise. Any technology with that combination of properties spreads into every niche it can reach, and that is precisely what happened over the last two decades.

Where you meet them without noticing

The batteries people think about are the ones in their pocket. The ones that matter to a country are invisible. A mobile base station holds a string that carries the site through every outage, which is why your call does not drop when the lights go out. A substation has a DC system whose only job is to make sure protection relays and breaker trip coils still work when the very thing they are protecting has failed. A data hall has a UPS that bridges the seconds between grid loss and generator load acceptance. A hospital has both, plus batteries inside individual devices. A factory has them on drives and PLCs so that a one second dip does not become a four hour restart. None of these are optional, and in almost every case the battery is the cheapest component protecting the most expensive process.

How it differs from a car battery

This is the single most common and most expensive misunderstanding we meet on site. A starter battery delivers a very high current for a few seconds and is then recharged immediately by the alternator; it is optimised for a short violent burst and shallow use. An industrial battery does the opposite: it may sit at float voltage for years, then deliver a moderate current for minutes or hours, and it may repeat that hundreds or thousands of times. Plates, grid alloys, separators, and electrolyte management are all built for that duty. A starter battery placed in a standby role usually fails within months, and it fails at the worst possible moment, because that is the only moment anyone asks it to work.

The main families

Four families cover almost every project in the region. There is no best one; there is only the one that matches duty cycle, available space, ventilation, ambient temperature, and how long the asset must last. Anyone who leads with a chemistry before asking about the load profile is selling, not engineering.

Typical design life and duty fit by battery family.
Family	Design life	Best fit	Watch out for
VRLA AGM	5 to 12 years	UPS, telecom standby	Heat sensitivity
VRLA GEL	8 to 15 years	Cycling, warm sites	Slower recharge
OPzS flooded	15 to 20 years	Substations, long life	Watering, ventilation
Lithium LFP	10 to 15 years	Daily cycling, tight space	Upfront cost, BMS

How capacity is actually rated

Capacity in ampere hours is meaningless without a discharge rate and an end voltage. A 100 Ah battery at the 10 hour rate does not deliver 100 Ah at the 1 hour rate; it typically delivers around 60 to 70 percent of it. Two datasheets that look identical on the front page can differ by a third once you read the discharge tables. Always compare batteries at the discharge rate your load actually imposes, always confirm the end of discharge voltage used, and always check the reference temperature. Most disappointing autonomy results we are called to investigate are not faults at all: the battery is delivering exactly what the datasheet promised, at a rate nobody checked.

Why batteries age, and what shortens their life

Three things kill batteries: heat, wrong charging, and neglect. Heat is the dominant one. As a rule of thumb, every 10 degrees Celsius above 20 degrees roughly halves lead acid service life, so a cabinet at 40 degrees turns a twelve year battery into a three year battery. Charging is the second: a float voltage set even a fraction too high dries VRLA cells, and one set too low leaves them chronically undercharged and sulphated. Neglect is the third and the most avoidable: a string nobody has tested is not a backup, it is an assumption. Temperature control and a testing routine will do more for your total cost of ownership than any brand decision.

From backup to active asset

For most of their history, industrial batteries were insurance: bought, installed, and hopefully never used. That is changing. Once storage became cheap enough to cycle daily, the same cabinet that protects a load can also shift energy in time, absorbing solar production at noon and releasing it in the evening, smoothing peaks, and holding a site stable through the weak grid moments that are normal across much of the region. The engineering consequence is significant: a battery that cycles is dimensioned by energy throughput and thermal management, not just by autonomy minutes. The commercial consequence is that a battery can now earn rather than merely protect, which is why we increasingly specify one system to do both.

How we specify one in practice

A specification that holds up starts with four numbers and one honest conversation. The numbers: the real load in watts or amps, the autonomy required at that load, the end of discharge voltage the equipment tolerates, and the worst case ambient temperature at the installation point. The conversation is about consequence: what actually happens if this fails, and for how long can it be gone. From there the family, the string configuration, the charger, the ventilation, the enclosure, and the test regime follow logically. We choose the platform that fits the case, from established manufacturers we have serviced for years, and we stay accountable for sizing, installation, testing, and lifecycle service. Chemistry is the last decision, not the first.

Frequently asked

How long does an industrial battery last?: Design life ranges from 5 years for economy VRLA to 20 years for OPzS. Real service life is usually shorter, because every 10 degrees Celsius above 20 degrees roughly halves lead acid life. Temperature control matters more than brand.
What is the difference between kW and kWh?: kW is power, how much the battery can deliver at any instant, and it decides which appliances or loads can run at all. kWh is energy, how much it holds in total, and it decides how long they run. A system can have enough energy and still trip on power, or plenty of power and run out in minutes.
When is a battery considered end of life?: The standard threshold is 80 percent of rated capacity, confirmed by a load bank discharge test. Below that, capacity falls quickly and autonomy becomes unpredictable, so replacement is planned rather than reactive.
Can lithium and lead acid be mixed in one string?: No. Charge voltages, internal resistance, and management requirements differ, and the weaker chemistry is driven outside its window. Replace a string as a set, with matched cells of the same age and type.
Is lithium always the better choice now?: No. Lithium wins where space is tight, temperatures are high, or the system cycles daily. For a substation DC system that discharges rarely and must last twenty years, flooded lead acid is often still the more rational asset. The duty profile decides, not the trend.
What happens to batteries at the end of life?: They are collected, palletised, and transported to certified recyclers under a documented chain of custody. Lead acid is one of the most recycled products in the world, and lithium recovery is scaling. EXBATT arranges collection, transport, and disposal documentation, and hands over to certified third party recyclers.