LR44 batteries go into the battery compartment with the flat positive side facing up

An LR44 battery is a small, coin-shaped alkaline cell about the size of a dime. It powers watches, calculators, hearing aids, laser pointers, and small electronic toys. The battery has a flat positive (+) side and a rounded negative (−) side. To install one, you locate the battery compartment on your device, open it, and slide or drop the battery in with the positive side facing upward, then close the compartment. The whole process takes less than a minute.

LR44 batteries are also sold under other names — you may see them labeled as A76, AG13, or SR44, depending on the manufacturer. They are all roughly the same size and voltage, though SR44 batteries (silver oxide) last longer than LR44 (alkaline) and cost more. For most household devices, LR44 is the standard choice.

Key Takeaways

  • The positive (+) side of the battery must face upward when you insert it into the compartment.
  • Most devices have a small metal spring or clip inside the compartment that holds the battery in place.
  • If the battery does not sit flat or the compartment does not close easily, remove it and flip it over — you may have inserted it upside down.
  • Replace LR44 batteries when your device stops working or runs slowly; they typically last one to three years depending on use.

Locating and opening the battery compartment

The battery compartment is usually on the back or bottom of your device. Look for a small rectangular or circular door, often held in place by a single screw or a sliding latch. On watches, the compartment is usually on the back of the case. On calculators and remote controls, it is typically on the back or underside. On hearing aids, it is a small hinged door on the side or bottom of the device.

If your device has a screw, use a small Phillips or flathead screwdriver — the size depends on the device, but a jeweler's screwdriver set works well for small electronics. Turn the screw counterclockwise to loosen it, then lift the compartment door away. If the compartment has a sliding latch, push or slide it in the direction the arrow points (usually toward the center or edge of the device) until the door pops free. Set the screw or latch somewhere safe so you do not lose it.

Inserting the battery correctly

Before you touch the battery, look inside the compartment. You will see a metal spring or clip on one side — this holds the battery in place. The flat positive side of the LR44 should face toward this spring or clip. The rounded negative side should face the other side of the compartment.

Hold the battery between your thumb and forefinger, positive side up. Slide or drop it gently into the compartment so the positive side touches the spring or clip first. The battery should sit flat and snug. If it wobbles or tilts, remove it and check that you have not inserted it upside down. Once the battery is in place, close the compartment door and find it with the screw or latch. Turn the screw clockwise until it is snug — do not force it, as you can strip the threads.

Testing your device after battery installation

Once the compartment is closed, turn on your device or press a button to see if it works. A watch should start ticking. A calculator should display numbers when you press keys. A hearing aid should produce sound or a beep. If nothing happens, the battery may be dead (rare for a new battery, but possible), or you may have inserted it upside down.

If the device does not work, open the compartment again and remove the battery. Flip it over so the negative side now faces the spring, and reinsert it. Close the compartment and test again. If the device still does not work after trying both orientations, the battery may be faulty, or the device itself may need repair — contact the manufacturer or a repair shop.

Handling and storage tips

LR44 batteries are safe to handle with bare hands, but avoid touching the flat positive side with wet fingers or leaving fingerprints on it, as moisture can reduce performance. Store unused batteries in a cool, dry place — not in a humid bathroom or a hot car. Keep them in their original packaging or in a small plastic bag to prevent them from touching other metal objects, which can drain them.

Do not mix old and new batteries in the same device, and do not leave a dead battery in a compartment for weeks — it can leak and damage the contacts inside. When a battery stops working, remove it right away and replace it with a fresh one. If you notice corrosion (a white or blue crusty buildup) inside the compartment, clean it gently with a dry cotton swab before inserting a new battery.

When to replace an LR44 battery

Most LR44 batteries last between one and three years, depending on how often you use the device. A watch worn every day will drain the battery faster than a calculator used once a week. When your device starts to slow down — a watch ticks more slowly, a calculator responds sluggishly, a hearing aid sounds quieter — it is time to replace the battery.

Some devices have a low-battery indicator, such as a blinking light or a warning message. If you see one, replace the battery within a few days. Waiting too long can cause the battery to leak inside the compartment, which damages the device's internal contacts and may make it unusable until the contacts are cleaned or replaced by a professional.

Disposing of old LR44 batteries

Do not throw LR44 batteries in the trash. They contain alkaline material and metal that can harm the environment if they end up in a landfill. Instead, take them to a battery recycling program. Most electronics stores, pharmacies, and office supply chains have battery drop-off bins near the checkout or customer service desk. Some municipalities also run hazardous waste collection events where you can drop off batteries for free.

To find a recycling location near you, search online for "battery recycling near me" or visit your city or county's waste management website. If you have only one or two old batteries, storing them in a plastic bag in a cool place until you can drop them off is safe and does not harm the battery or your home.

Frequently Asked Questions

What is the difference between LR44 and SR44 batteries?

LR44 is alkaline and costs less; SR44 is silver oxide and lasts longer (up to twice as long in some devices). Both fit the same compartment. For devices you use daily, SR44 may be worth the extra cost. For occasional-use devices, LR44 is fine.

Can I use a different size battery if I do not have an LR44?

No. Using a battery that does not fit the compartment can damage the device or create a safety hazard. Stick to LR44 or the equivalent size listed in your device's manual. If you cannot find the right battery, contact the device manufacturer.

Why does my device still not work after I put in a new battery?

First, check that the positive side is facing up and the compartment is closed tightly. If that does not work, try a different new battery — the first one may have been defective. If a second battery does not work, the device itself may be broken and may need professional repair.

Is it safe to carry LR44 batteries in my pocket or bag?

Yes, as long as they are in their original packaging or a plastic bag. Loose batteries can touch metal objects like coins or keys, which can cause them to drain or overheat. Keep them separate from other metal items.

How do I know if a battery is dead without opening my device?

You usually cannot tell without opening the compartment and testing the device with a new battery. If your device has slowed down or stopped working, the battery is likely dead. Replace it and see if the device works again.