Does a 1L drink costing 3 euros cost more than a 0.5L drink costing 2 euros?

The answer seems trivial. Yet, it's precisely the mistake many make when commenting on the price of a battery.

Just look at the initial price, without asking How much energy will that battery really give back over time, It's like comparing two fizzy drinks by only looking at the price tag and ignoring how many litres are inside.

One coast is 3 euros, the other is 2 euros. But which one is really worth it? The one that gives you more content for every euro spent.

With batteries, the principle is the same. It's just that instead of litres, you have to look at the useful energy your battery will provide over the years.

The price alone says almost nothing

Two batteries might both have “10 kWh” written on the brochure, but this does not mean they are of the same value at all.

To understand whether a battery is expensive or cheap, it's not enough to ask yourself:

• “How much does it cost?”

One must ask oneself:

• How much energy will it really be able to deliver in its lifetime?
• For how many years will he do it?
• With what efficiency?
• What are the real-world performance figures, even in difficult conditions?
• With what guarantee and what support?

And this is where the most serious parameter of all comes into play: the LCOS.

LCOS, simply explained

LCOS means Levelised Cost of Storage. In simple terms: How much does each useful kWh that the battery returns to you over its lifetime really cost you.

It is the most correct way to compare two storage systems. Not the absolute price. Not the feeling. Not the quick comment under a post.

If a battery costs less upfront but lasts less long, performs poorly under certain conditions, or gives you less useful energy, it could actually more expensive.

Exactly like a small soft drink that only seems cheap because it has a lower price tag.

The correct comparison is made on useful energy over time.

When we talk about accumulation, there are some technical terms that make a difference. We explain them very simply.

Cycles

A cycle It's a full cycle of battery usage: it charges and then it discharges.

If a battery does 6,500 cycles, it means it can repeat this process thousands of times over its lifetime. More cycles generally means, more energy delivered over time.

DoD

Ministry of Defence means Depth of Discharge, that is to say depth of discharge.

In simple terms: it indicates how much of the battery's capacity you can actually use. A DoD of 91% means that you can harness a very high portion of the stored energy.

This is important because a battery is not worth what it promises on paper, but for How much of that energy can you actually use.

3) Efficiency

L’efficiency indicate how much energy enters and how much actually gets out.

With an efficiency of 95%, most of the energy that is charged is returned to the plant and the house. The higher the efficiency, the less energy is lost along the way.

4) Derating

The Derating It is the reduction in performance under certain operating conditions.

Some batteries, when they are near their charge or discharge limits, or when operating in less favourable conditions, They can no longer deliver the same power.

For the user, it means something very concrete: on paper, everything looks perfect, but in reality The available energy and battery thrust can decrease just when they are needed most..

The point isn't “how much it costs.” The point is “how much it's worth.”

If we take as a reference a battery that offers:

• 6,500 cycles
• DoD 91%
• efficiency 95%
• 10-year Italian warranty
• reliable performance even at low temperatures
• Absence of derating at charge extremes

Well, the serious comparison cannot be made by just looking at the list price.

This must be done by considering how much useful energy that battery will provide over the years, with what consistency, with what reliability, and with what quality of after-sales support.

A battery that works when others stop is worth more.

This is often overlooked.

Not all batteries behave the same way when temperatures drop. Not all maintain consistent performance when approaching charge extremes. Not all always manage to guarantee truly available power.

If a battery continues to supply energy in conditions where other technologies perform worse or are limited, then we are not talking about a technical detail for a brochure.

We are talking about real value.

Why a battery is precisely needed in moments when it must perform well: when you need energy, when the system must be stable, when you want continuity and no surprises.

The guarantee is not a bureaucratic detail

Also the 10-year Italian warranty It's not just a number to put at the bottom of the data sheet.

For the customer, it means knowing that there is a structure behind the product that responds, a clear point of reference, a close point of contact and defined coverage rules.

When we talk about accumulation, it's not just about buying an object. It's also about buying long-term reliability.

Let's make a simple argument.

Imagine two batteries:

• The first costs less, but has fewer cycles, less usable energy, and degrades performance in some conditions.;
• The second costs more, but returns much more useful energy over its lifetime, with more stable performance and a solid warranty.

Which one is really the cheapest?

The one with the lowest initial price?

Or that which, at the end of the day, it costs you less per kWh actually delivered?

This is why LCOS is the correct parameter. Because it takes impressions off the table and brings everything back to a concrete basis.

The price alone becomes a misleading piece of information.

When considering:

• the useful life of the battery,
• the actually usable energy,
• efficiency,
• performance stability,
• behaviour at low temperatures,
• the absence of derating at the extremes of charge,
• The 10-year Italian warranty,

then the price taken in isolation ceases to be the main criterion.

Become an isolated number, often misused.

The real issue is something else: How much useful energy will you take home for every euro spent.

Next time, let's ask the right question.

So yes, back to the initial provocation.

Does a 1L drink costing 3 euros cost more than a 0.5L drink costing 2 euros?

It depends on how much drink you're buying for each euro spent.

When it comes to batteries, it's the same. Except instead of litres, you need to look at the kWh over time.

Therefore, comparing two batteries based on price alone is a mistake.

The serious comparison is with LCOS. Everything else is noise.