357 and LR44 batteries are not identical, but they are often interchangeable

A 357 battery and an LR44 battery have the same physical size and voltage, which is why they are frequently swapped in the same device. Both are 1.5-volt button cells with a diameter of 11.6 mm and a height of 5.4 mm. However, they differ in chemistry and capacity. A 357 is typically silver oxide, while an LR44 is alkaline. This means a 357 will last longer in most devices but costs more, and an LR44 is cheaper but drains faster.

Before you buy either one, check your device's manual or the battery compartment itself. The label will usually tell you which type the manufacturer recommends. Using the wrong chemistry can shorten battery life or, in rare cases, cause leakage in sensitive electronics like hearing aids or watches.

Key Takeaways

  • 357 and LR44 batteries are physically identical and have the same voltage, so most devices will accept either one.
  • A 357 is silver oxide and lasts two to three times longer than an LR44 alkaline battery in the same device.
  • An LR44 costs less upfront but will need replacing more often, making a 357 cheaper over time in high-drain devices.
  • Always check your device manual or battery compartment label before substituting, because some electronics perform poorly or leak with the wrong chemistry.

The difference between 357 silver oxide and LR44 alkaline

The 357 is a silver oxide battery, which means it uses silver oxide as its chemical compound. Silver oxide batteries maintain a steady voltage throughout their discharge cycle, which is why they are preferred in precision devices like watches and light meters. They also have a higher energy density, meaning they pack more power into the same size.

The LR44 is an alkaline battery, which uses alkaline chemistry instead. Alkaline batteries are cheaper to manufacture and sell for less money. However, their voltage drops gradually as they discharge, which can cause dimming in LED devices or sluggish performance in motorized toys. In a watch or hearing aid, this voltage drop can be noticeable.

Both batteries are 1.5 volts when new, so a device designed for one will power up with the other. The problem emerges over time: the 357 holds its voltage longer, while the LR44 fades faster. In a low-power device like a calculator, you may not notice the difference. In a hearing aid or camera light meter, you will.

How long each battery lasts in common devices

Battery life depends on how much power the device draws. A 357 typically lasts two to three times longer than an LR44 in the same device, but the actual hours or days vary widely.

In a watch, a 357 may run for one to two years, while an LR44 might last four to eight months. In a hearing aid, a 357 can power the device for five to seven days of normal use, while an LR44 lasts two to three days. In a laser pointer or LED flashlight, an LR44 may be exhausted in hours, while a 357 lasts for days. In a calculator or scale, both batteries may last for months because the power draw is minimal.

The takeaway is this: if you use the device daily and it draws steady power, a 357 will cost less over a year because you will replace it fewer times. If you use it rarely, an LR44 is cheaper because you will throw it away before it dies anyway.

When you can safely swap them and when you cannot

Most consumer devices—watches, calculators, toys, laser pointers, and small flashlights—will work with either battery. The device will power on and function normally with either a 357 or LR44 in the compartment.

However, some devices should not use an LR44 when a 357 is specified. Hearing aids are the most common example. Hearing aid circuits are tuned to the voltage curve of a silver oxide battery. An LR44 will work at first, but as it drains, the voltage drop can cause the hearing aid to cut out or perform erratically. Precision light meters in cameras also perform better with a 357 because they measure light intensity and need stable voltage. Some medical devices and high-end watches also specify silver oxide for this reason.

Conversely, if a device specifies an LR44 and you use a 357, no harm will occur—the device will straightforward work normally. The risk of damage is minimal in either direction, but performance may suffer if you use the wrong type in a precision device.

Cost comparison over time

An LR44 typically costs between $0.50 and $1.50 per battery, depending on the brand and where you buy it. A 357 costs between $1.50 and $3.00 per battery. At first glance, the LR44 is cheaper.

However, if you own a device that draws power steadily—a hearing aid, a watch, or a camera—the 357 will cost less per year. If a 357 lasts three times longer, you buy three LR44s for every one 357 you would have bought. Three LR44s at $1.00 each cost $3.00. One 357 at $2.00 costs $2.00. Over a year, the 357 saves money.

For devices you use rarely or that draw minimal power, an LR44 is the better choice. You will replace it less often because the device sits unused, so the lower upfront cost matters more than longevity.

How to tell which battery your device needs

The most reliable way to find out is to open the battery compartment and read the label. Most devices print the battery type directly on the inside of the compartment door or on the battery holder itself. You will see either "357" or "LR44" printed there, sometimes alongside other equivalent names.

A 357 may also be labeled as SR44, SR44W, or 1.55V (because silver oxide batteries are 1.55 volts, not 1.5). An LR44 may be labeled as A76, AG13, or L1154. These are all equivalent names for the same battery types. If you see any of these names, you know which chemistry to buy.

If the compartment is blank, check the device manual or the manufacturer's website. If you cannot find either, a 357 is the safer choice because it works in any device that accepts an LR44, but an LR44 may not perform well in a device designed for a 357.

Storage and safety considerations

Both 357 and LR44 batteries are safe to store at room temperature in a dry place. Keep them away from metal objects that could short-circuit them, and do not store them in a hot car or near a heat source. Both types can leak if stored improperly or if they are old and have begun to discharge inside a device.

If a battery leaks inside your device, remove it when ready and clean the compartment with a dry cloth or a cotton swab. Do not touch the leaked material directly; wear gloves if possible. Leaked alkaline batteries are more corrosive than leaked silver oxide batteries, so an LR44 leak is more likely to damage the device's contacts.

Always remove batteries from devices you will not use for more than a few months. A battery left in a device will eventually leak, even if the device is off. This is especially important for hearing aids, which are often stored for long periods between uses.

Frequently Asked Questions

Can I use a 357 in a device that says LR44?

Yes. A 357 will work in any device designed for an LR44 because they are the same size and voltage. The device will perform normally or even better because the 357 lasts longer. The only reason not to use a 357 is cost—if the device draws very little power, the extra longevity is wasted.

Can I use an LR44 in a device that says 357?

It will power on, but performance may suffer. Hearing aids, watches, and light meters are most affected because they rely on stable voltage. An LR44 will work at first but may cause the device to cut out or perform poorly as the battery drains. For these devices, use a 357.

What does the "LR" in LR44 mean?

LR stands for alkaline battery. The "44" refers to the size and shape. The "SR" in SR44 (another name for a 357) stands for silver oxide. Both numbers describe the same physical dimensions, which is why they are interchangeable.

Do 357 batteries expire?

Button cell batteries do not have a true expiration date, but they lose charge over time if stored. A 357 stored in a cool, dry place will remain usable for several years. Once installed in a device, it will discharge whether the device is used or not, so remove unused batteries to prevent leakage.

Why is my hearing aid dying faster with an LR44?

Hearing aids draw steady power and rely on stable voltage. An LR44's voltage drops as it discharges, which can cause the hearing aid to cut out before the battery is completely dead. A 357 maintains voltage longer, so the hearing aid works normally until the battery is nearly exhausted. Use a 357 in a hearing aid for better performance.