Flat Battery Sizes – Introduction and Meaning

Thanks to the invention of batteries, we have so many portable small gadgets in the world today. It’s hard to imagine where the world would be today without batteries.

Batteries come in different sizes, capacities, and appearances to meet specific user needs. One of the most common types is flat batteries.

Today, we will be sharing more information on flat battery sizes. We understand many people don’t know what kind of batteries they have or what certain figures on the batteries mean.

Don’t worry; we have designed a detailed guide that will answer all your questions. Keep reading.

Small Flat Battery Sizes

What comes to mind when you hear the term flat batteries? For many people, it’s all about their batteries running out of power. For example, you will say you have a flat battery when your car can’t start in the morning because you forgot to turn off the headlights. Or, perhaps your battery is too old and no longer has the capacity to power your vehicle.

That is different from the flat we are talking about. Instead, this discussion is about small batteries of various chemistries designed in a flat way. They are just flat from their appearance.

The most common name for small flat batteries is button/coil cells. Or rather, these two are the main categories of these batteries, which is why ‘flat’ is not a very common term.

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Button/coin batteries are often those batteries you don’t see until your watch, remote control, or car keys stop working. You become frustrated, wondering where to get a replacement.

As mentioned earlier, flat batteries may appear in two main categories:

Coin cells. These are wide and slimmer batteries and look more like a coin. You will find them in key car keys, remote controls, and similar devices.

Button cells. These are narrower in diameter. Also, they are taller and stockier in their design compared to the coin cells.

Even though the batteries seem to have distinct features, they have no major differences. So, don’t stress yourself wondering which is which when you come across them. You can call them whatever you want, as long as you understand that they are flat batteries.

Like any standard batteries, flat batteries come with unique numbers on their back, which shows their sizes. You can find size charts easily on the internet if you want to confirm your battery.

These sizes include the following:

LR1130, AG10. 389, 390

If you open your remote control, you will probably find an LR1130 flat battery. This is one of the most common options on the market and is used widely in such devices. They are also applicable in car keys, garage openers, micro LEDs, and calculators. Because of their popularity, most companies manufacture them, and that is why you will easily find one in your local store.

Different brands use various labels, such as LR1131, LR54, SR1130, AG10, 389, and so on. This has confused many users, but it should be different from when you know they mean the same thing.

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3LR12 3R12 4.5 volts flat batteries

Battery packs are created by arranging several cells in series or parallel to achieve a higher voltage. A great example of such batteries is the 3LR12. This is a flat, rectangular battery made from three “B” cells in a series connection, making 4.5 volts.

In this post, this was one of the most common batteries you would find in various applications. Today, however, they are less common than more advanced options have been designed. But you can still find them in flashlights, toy remote controllers, and other smaller applications.

SR41 and LR41

Try opening a digital thermometer and see the type of battery used. You will probably find an SR41/LR41. These batteries are also designed to work in wristwatches, toys, remote controls, and such applications.

These batteries are easily available on the market. They feature similar discharge characteristics and may have different labeling from manufacturers, which could also confuse consumers.

CR2450

This is another common lithium non-rechargeable battery found in motherboards, medical devices, car remote keys, security systems, and so on. They are often defined by higher capacity and a much lower discharge rate compared to batteries of similar sizes.

There are many other sizes in this category that you will meet as you keep learning about batteries. It’s important that now you know which sizes are available and perhaps what makes them so different.

What is the Most Common Flat Battery Size?

Flat batteries come in different sizes. Any battery that has a flat surface is called a flat battery. They are the opposite of conical batteries.

That could mean even the battery in your mobile phone is a flat battery. There are various common flat batteries according to specifications and required users.

For instance, lithium-ion CR2412/BR2412 is one of the most common button cell type rechargeable batteries. They are most common in small card-like devices, watches, car keys, memory back-ups, medical devices, and so on. You will find the batteries easily from your local or online stores.

Today, flat batteries are used in a wide range of devices. Generally, the most common ones are lithium based. This is because, for instance, lithium-ion batteries are considered to have the best capacity and can last much longer than any other.

When it comes to non-rechargeable batteries, alkaline batteries used in car keys, remote controls, watches, and similar devices carry the day. Every manufacturer today makes such batteries because they have a larger market base, which makes them easy to sell.

What Do the Numbers of Flat Batteries Mean?

Every battery comes with certain numbers. Now, don’t think these numbers are only for decoration – they carry a huge significance.

The code on coin cells consists of two letters followed by four or three numbers. This is a conventional naming procedure outlined by the International Electronical Commission (IEC). The first two letters tell the battery type and its shape. The numbers that follow indicate the dimensions of the battery and come with a three-digit code.

The battery may also have the last two digits that indicate its height in tenths of a millimeter. It’s important to know this dimension as it allows users to get the right battery for specific needs.