LR44 and 357 batteries are not the same, but they are often used interchangeably

LR44 and 357 batteries look identical and have the same voltage—1.5 volts—but they are not manufactured to the same standard. An LR44 is an alkaline battery, while a 357 is a silver oxide battery. The difference matters because silver oxide batteries hold their voltage more steadily as they drain, while alkaline batteries lose voltage gradually. In many devices, you can swap one for the other without when ready problems, but the device may not work as intended or may drain the battery faster than expected.

The physical dimensions are the same: both are 11.6 mm in diameter and 5.4 mm thick. They fit the same slot in watches, calculators, hearing aids, and small electronics. But because they behave differently electrically, using the wrong type can shorten battery life or cause a device to malfunction.

Key Takeaways

  • LR44 is alkaline; 357 is silver oxide—different chemistry means different voltage stability and lifespan.
  • Both are 1.5 volts and fit the same physical space, so they are mechanically interchangeable in most devices.
  • A 357 battery lasts longer and holds voltage more steadily, making it the better choice for precision devices like watches and hearing aids.
  • Using an LR44 in a device designed for 357 may work temporarily but can cause the device to run slow or drain faster than normal.
  • Check your device manual or the battery compartment label to see which type is recommended.

Why the voltage behavior is different

An alkaline battery (LR44) starts at 1.5 volts and drops steadily as you use it. By the time it reaches 0.9 volts, it is considered dead for most purposes. A silver oxide battery (357) also starts at 1.5 volts, but it holds that voltage much longer before dropping off sharply at the end of its life. This flat discharge curve is why silver oxide batteries are preferred in watches and hearing aids—the device receives consistent power throughout the battery's lifespan.

Devices designed for 357 batteries expect that steady voltage. If you put an LR44 in instead, the device may work at first, but as the voltage drops, a watch might run slow, a hearing aid might lose volume, or a calculator might display dimly. The device is not broken; it is just receiving less power than it was designed to handle.

Which devices need which battery

Watches, especially quartz watches, almost always call for a 357 battery. The timing circuit in a watch is sensitive to voltage fluctuations, and the flat discharge curve of a silver oxide battery keeps the watch running at the correct speed. Hearing aids also typically use 357 batteries for the same reason—consistent power means consistent sound output.

Calculators, remote controls, and some small electronics are less sensitive and often work fine with either type. The manual or the battery compartment will usually say which one is recommended. If it says 357, use a 357. If it says LR44, an LR44 is the right choice, though a 357 will work and may last longer.

Some devices list both as acceptable—you may see "LR44/357" on the label. In that case, either will work, though the 357 is the better choice if you want longer battery life.

Cost and availability differences

LR44 batteries are cheaper and more widely available because they are alkaline and used in a broader range of devices. You can find them at any pharmacy, grocery store, or dollar store. A pack of four LR44 batteries typically costs between $3 and $6.

357 batteries are more expensive because they are silver oxide and less commonly stocked. You may need to order them online or visit a watch repair shop or jewelry store. A pack of four 357 batteries usually costs between $8 and $15. The higher price reflects both the silver oxide chemistry and the smaller market demand.

If your device accepts either type, the LR44 is the budget choice. If your device is designed for 357, paying more for the correct battery is worth it—you will get longer life and better performance.

What happens if you use the wrong battery

Using an LR44 in a device designed for 357 will usually not cause damage, but the device may not perform correctly. A watch might lose a few seconds per day. A hearing aid might sound quieter than normal. A calculator might display numbers dimly. These problems typically appear after a few weeks of use, as the LR44's voltage drops.

Using a 357 in a device designed for LR44 is generally safer—the device will work fine, and the battery may last longer. The only downside is the higher cost. Some very old or very sensitive devices might behave unpredictably with a 357, but this is rare.

If a device stops working after you swap batteries, put the correct type back in. If the device still does not work, the problem is likely something else.

How to tell which battery your device needs

The easiest way is to look at the battery compartment. Most devices print the battery type right on the inside of the cover or on the compartment itself. You may see "357", "LR44", or both listed.

If the compartment is blank, check the device manual or the manufacturer's website. Search for the device model number plus "battery type" and you will usually find the answer in seconds.

If you have no manual and cannot find the information online, look at the old battery. If it is silver-colored and labeled 357, use a 357. If it is labeled LR44 or SR44, use an LR44. When in doubt, a 357 is the safer choice—it will work in most devices and last longer.

Other battery names you might see

Battery naming is confusing because the same battery has multiple names depending on who made it and what standard they followed. A 357 battery might also be labeled SR57, SR44, or S76, depending on the manufacturer. An LR44 might be called A76, PX76, or V13GA. These are all the same size and voltage, just with different naming conventions.

The key distinction is still the chemistry: if the name starts with "S" or "SR", it is silver oxide (like 357). If it starts with "L" or "A", it is alkaline (like LR44). When you are buying a replacement, match the name on your device as closely as possible, but knowing the chemistry helps you understand what you are choosing.

Frequently Asked Questions

Can I use an LR44 instead of a 357 in my watch?

You can, but the watch may run slow or stop working after a few weeks. Watches are designed for the steady voltage of a 357 battery. An LR44 will work at first, but as its voltage drops, the watch's timing circuit will slow down. Use a 357 for the best performance.

Will a 357 battery damage a device designed for LR44?

No. A 357 will work fine in a device designed for LR44 and will likely last longer. The only downside is the higher cost. Some very old devices might behave unpredictably, but this is rare.

Why is a 357 battery more expensive than an LR44?

A 357 is silver oxide, which costs more to manufacture than alkaline chemistry. Silver oxide batteries also hold their voltage longer, which adds value. LR44 batteries are alkaline and cheaper to make, so they cost less even though they do not last as long.

What does the number in the battery name mean?

The number refers to the physical size and shape. Both 357 and LR44 are the same size (11.6 mm diameter, 5.4 mm thick), so the numbers are different just because different manufacturers use different naming systems. The letter prefix tells you the chemistry: S or SR means silver oxide, L means alkaline.

Can I store LR44 and 357 batteries together?

Yes, storing them together is fine. Keep all batteries in a cool, dry place away from metal objects that could cause them to short circuit. Do not store dead batteries with fresh ones, as the dead ones may leak and damage the fresh ones.