LR43 vs SR43: Choosing the Right Button Cell for Your Device

Choosing the right battery is very important. It may look like a small part, but it affects the life, safety, and stability of your device. Many engineers and buyers must choose between LR43 and SR43 button cells. They look the same in size, but they are different in how they work and what they are good for.

This article explains the main differences between LR43 and SR43. It also gives advice on how to use them in real devices and what to watch out for when buying.

LR41

Nominal Voltage：1.5V

Battery type：Alkaline Manganese Batteries

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What Is LR43?

LR43 is a small alkaline battery. Its voltage is 1.5V. It is used in low-cost products like small toys, LED lights, laser pointers, and basic remotes. These devices do not need very stable voltage, so LR43 is good enough.

LR43 batteries are cheap and easy to find. Many brands make them. So, they are a good choice for projects with a small budget.

But there is one problem. Alkaline batteries lose voltage quickly over time. As the battery is used, the voltage drops. If your device needs a stable voltage, LR43 might not work well. It can cause errors or stop working too early.

What Is SR43?

SR43 is also a button cell, but it uses silver oxide inside. Its voltage is 1.55V. It gives a more stable output and keeps the voltage almost the same during use. Because of this, it works well in devices that need high precision.

Devices like medical tools, watches, digital thermometers, and small timers often use SR43. It lasts longer and performs better than LR43.

The downside is the cost. SR43 is more expensive than LR43. But if your product needs long life and stable power, SR43 is the better choice.

Key Differences Between LR43 and SR43

Here is a simple table that compares the two:

Can You Use One Instead of the Other?

LR43 and SR43 have the same size. So, they can fit into the same battery slot. But that does not mean they always work the same.

If your device does not need stable voltage, you can use LR43. But if it needs stable and long-lasting power, LR43 is not a good idea. It may stop working too soon.

SR43 works better in more cases. It can be used in most LR43 devices too. So, it is more flexible. But the higher price might be a problem if your project has a low budget.

In short:

• If the device needs precision → use SR43.

• If the device is simple → LR43 may be okay.

Tips for Engineers and Buyers

For engineers:
When you design a circuit, check these things:

• Does your device run for a long time?

• Is stable voltage important?

• Do you need safe, tested, and certified parts?

If your answer is “yes”, SR43 is the safer pick. If not, LR43 may save you money.

For buyers:

• Always check the full battery code, not just “43”.

• Ask your supplier if the product is real LR43 or SR43.

• Some sellers use names like AG12, which may be wrong or mixed types.

• If your product goes to the EU or US, check if it follows RoHS or REACH rules.

Common Mistakes

Many people think LR43 and SR43 are the same because they look the same. But they are not. They have different chemicals and give power in different ways.

One big mistake is using LR43 in a product that needs SR43. This can cause short battery life, low performance, or customer complaints.

Another mistake is using the code “AG12” without checking the real battery type. AG12 is not a full name. Some AG12s are LR43, others are SR43.

Always check the full name and test the battery if needed.

Conclusion: Small Chips, Big Impact

LR43 and SR43 are small, but they matter. LR43 is cheaper and fine for basic tools. SR43 costs more but works better in smart and sensitive devices.

If you are an engineer, make your choice based on what the device really needs. If you are a buyer, confirm the battery type with your supplier and do not only look at price.

When cost, life, and safety must work together, SR43 is often worth the higher cost. But for low-risk, short-term devices, LR43 still works well.

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