You should always use the sr621sw or sr626sw battery your device needs. Both batteries have the same width, but the sr626sw is taller. The sr626sw also has more power than the sr621sw. If you use the wrong battery, it might not fit right. Your watch or device might not work as well. Studies show using the wrong battery can be unsafe. Non-approved watch batteries can cause big safety problems. Always look at your device manual or battery spot for the right battery. This helps you avoid breaking your watch or device. It also keeps your device safe and working well.
Key Takeaways
- Always use the right battery size for your device. This helps stop damage or bad performance. SR626SW batteries are taller than SR621SW. They also hold more power. They last longer if your device can use them. Both batteries give the same voltage. But their height difference changes how they fit and how safe they are. Look at your device manual or battery spot for the right battery code before you buy. Keep batteries in a cool, dry place. Keep them away from metal. Recycle old batteries to get rid of them safely.
SR621SW vs SR626SW
Battery Size
Both the sr621sw and sr626sw battery are the same width. Their heights are not the same. This is important when you put a battery in your device. The sr621sw battery is 6.8 mm wide and 2.0 mm tall. The sr626sw battery is also 6.8 mm wide, but it is 2.6 mm tall. The height difference is only 0.6 mm, but it can matter a lot. If you use a sr621sw where a sr626sw should go, it might be too loose. If you use a sr626sw where a sr621sw should go, it could be too tight and hurt your device.
| Battery Model | Diameter (mm) | Height (mm) |
|---|---|---|
| SR621SW | 6.8 | 2.0 |
| SR626SW | 6.8 | 2.6 |
Tip: Always look at your device or manual to find the right battery size. Using the correct sr626sw battery or sr621sw battery helps your device work well and stay safe.
Battery Capacity
The sr626sw battery can hold more energy than the sr621sw. This means your device will last longer before you need a new battery. The sr621sw battery usually holds between 18 and 25 milliampere-hours (mAh). The sr626sw battery holds a bit more, between 25 and 27 mAh. The sr626sw battery is taller, so it can store more energy. If your device fits a sr626sw battery, you will get more time before changing it.
| Battery Model | Dimensions (mm) | Nominal Capacity (mAh) | Nominal Voltage (V) |
|---|---|---|---|
| SR621SW | 6.8 x 2.1 | 18-25 | 1.55 |
| SR626SW | 6.8 x 2.6 | 25-27 | 1.55 |
Voltage
Both the sr621sw and sr626sw battery give the same voltage. Each one gives your device 1.55 volts. This is important for watches and small electronics. It helps them keep time and work right. You do not need to worry about voltage when picking between sr621sw and sr626sw. You just need to match the size and how much energy it holds.
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sr621sw battery voltage: 1.55V
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sr626sw battery voltage: 1.55V
Typical Uses
You can find the sr626sw battery and sr621sw battery in many small things. The sr621sw battery is used in watches, calculators, remotes, alarm clocks, games, cameras, and some medical tools. The sr626sw battery is also used in watches. It is good for devices that need more power or last longer.
Here are some common uses for each battery:
| Device Type | sr621sw Battery Uses | sr626sw Battery Uses |
|---|---|---|
| Watches | Used in thin or small watches | Used in watches that need to last longer |
| Calculators | Powers small calculators | Powers calculators that need more energy |
| Remote Controls | Used in TV and small remotes | Used in remotes that need to last longer |
| Alarm Clocks | Keeps alarm clocks working | Used in clocks with more features or longer standby |
| Electronic Games | Powers handheld games | Used in games that need more energy for lights or sound |
| Cameras | Used in small cameras | Used in cameras that need to last longer |
| Medical Instruments | Used in some medical devices | Used in medical devices that need steady and long-lasting power |
These batteries can have other names too. The sr626sw battery is sometimes called 376, 377, ag4, lr626, lr66, or sr626. The sr621sw battery can also be called 364, ag1, or lr621. The ag4, lr626, and lr66 names are for alkaline batteries, but the sr626sw battery is a silver-oxide type. Silver-oxide batteries give more steady power. Always check if your device needs a silver-oxide or alkaline battery.
| Battery Code(s) | Chemistry | Size (mm) | Voltage | Capacity (mAh) | Notes and Equivalents |
|---|---|---|---|---|---|
| SR626SW | Silver-Oxide | 6.8 x 2.6 | 1.55 V | 25-27 | 376, 377, ag4, lr626, lr66, sr626 |
| SR621SW | Silver-Oxide | 6.8 x 2.1 | 1.55 V | 18-23 | 364, ag1, lr621 |
| LR626, LR66, AG4 | Alkaline | 6.8 x 2.6 | 1.5 V | 15-17 | Sometimes labeled ag4 |
Note: The sr626sw battery, ag4, lr626, and lr66 can be used in the same devices. Silver-oxide batteries like sr626sw last longer and give more steady power than alkaline types.
SR626SW Battery Compatibility
Device Fit
When you pick a sr626sw battery, check the height. The sr626sw battery is 2.6 mm thick. This number seems small, but it matters a lot. Small devices like watches and calculators have tight spaces for batteries. Even a tiny difference in thickness can cause trouble.
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The sr626sw battery fits well in devices made for it. If you use a thinner battery, like the sr621sw, it may feel loose. This can make the battery not touch the device’s terminals right.
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If the battery is loose, your watch might stop or reset. Sometimes, the device only works if you press the battery cover.
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The sr626sw battery is made for watches with alarms or backlights. It uses potassium hydroxide inside and has low resistance. This helps it give more power when needed.
Note: Always check your device or manual before buying a sr626sw battery. Using the wrong size can break your device or make it not work right.
Here is a quick chart showing how the sr626sw battery compares to others:
| Battery Model | Height (mm) | Typical Devices | Fit Issues if Wrong Size Used |
|---|---|---|---|
| sr626sw | 2.6 | Watches, calculators, ag4, lr626, lr66 devices | Too thick can damage device |
| sr621sw | 2.1 | Thin watches, small devices | Too thin can cause loose contact |
| ag4, lr626, lr66 | 2.6 | Same as sr626sw | Usually compatible if same chemistry |
Interchangeability
You may wonder if you can swap a sr626sw battery with a sr621sw, ag4, lr626, or lr66. The answer depends on your device. The sr626sw, ag4, lr626, and lr66 all have the same size. You can usually use any of these if your device needs a sr626sw battery and the chemistry matches.
But the sr621sw battery is shorter. If you put a sr621sw in a device made for sr626sw, it may not touch the contacts well. This can make your watch or device lose power or work only sometimes. If you try to use a sr626sw in a device made for sr621sw, it may be too tall. This can press on the battery compartment and hurt your device.
Only swap batteries if:
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The battery slot fits the sr626sw, ag4, lr626, or lr66 without forcing it.
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The contacts touch the battery well, so power is steady.
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The manual says ag4, lr626, or lr66 work with sr626sw.
Do not swap batteries if:
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The battery feels loose or rattles in the slot.
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The cover is hard to close or feels tight.
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The manual does not list sr626sw, ag4, lr626, or lr66.
Tip: For best results, always use the battery your device asks for. This keeps your watch or device safe and working well.
Here is a summary table for quick help:
| Device Battery Slot Says | Can Use sr626sw? | Can Use ag4, lr626, lr66? | Can Use sr621sw? |
|---|---|---|---|
| sr626sw | Yes | Yes | Not recommended |
| ag4, lr626, lr66 | Yes | Yes | Not recommended |
| sr621sw | Not recommended | Not recommended | Yes |
If you use the right sr626sw battery, ag4, lr626, or lr66, your device will work as it should. Using the wrong size can make your device work badly or even break it.
Choosing the Right SR621SW Battery
Identifying Battery Type
To know if your device needs an sr621sw battery, check a few things. Open the battery compartment and look inside. Most devices show the battery size and model number near the slot. For the sr621sw battery, you should see 6.8 mm for width and 2.1 or 2.2 mm for height. The right voltage is 1.55V. Many devices also list other codes that work. These codes can be LR60, LR620, SR60, SR60L, CX60, 621, SR621, SR621SW, SR621W, S621E, R621, TR621, L621, LR621W, 364, V364, or GP364. Always pick a battery from a brand you trust. This helps you avoid fake batteries. Make sure the size and voltage match so your device works right and stays safe.
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Look in the battery compartment for size and model.
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Make sure the voltage is 1.55V.
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Check for any of the codes listed above.
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Buy batteries from trusted brands for best results.
Checking Manuals and Markings
Manuals and battery compartments help you find the right battery. Manuals often tell you the exact battery you need. You might also see special codes or UN numbers on your device or its box. These markings tell you if your battery is lithium-ion, lithium metal, or silver oxide. For sr621sw and sr626sw, you need to use the silver oxide type.
| Battery Type | Packaging Method | UN Number |
|---|---|---|
| Lithium-ion | Standalone (shipped alone) | UN3480 |
| Lithium-ion | In or with equipment | UN3481 |
| Lithium metal | Standalone | UN3090 |
| Lithium metal | In or with equipment | UN3091 |
Tip: Always match the battery type and code in your manual or on the compartment. This helps you avoid mistakes.
Replacement Tips
When you change the sr621sw battery, follow these tips to keep your device working well:
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Only use batteries that match the size and voltage your device needs.
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Be gentle with batteries. Do not crush or bend them.
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Keep new batteries in a cool, dry place away from metal.
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Never mix different battery types or brands in one device.
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Check for leaks or rust before and after you change the battery.
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Take old batteries to a recycling center.
Here are mistakes you should not make:
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Do not use the wrong size, voltage, or battery type.
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Only buy batteries from stores you trust.
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Check the expiration date before using a new battery.
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Keep batteries away from heat and water.
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Remove and recycle any battery that is damaged or leaking.
Note: If you follow these tips, your devices will last longer and stay safe.
Battery Life and Performance
Lifespan Comparison
When you pick a battery for your watch, you want it to last. Both SR621SW and SR626SW batteries use silver oxide. This gives steady power to your device. But they do not last the same amount of time. The SR626SW battery can hold more energy than the SR621SW. This means it will run your watch or device longer before you need a new one.
Here is a simple table to compare both batteries:
| Battery Model | Diameter (mm) | Height (mm) | Capacity (mAh) | Voltage (V) | Weight (g) |
|---|---|---|---|---|---|
| SR621SW | 6.8 | 2.1 | 18-23 | ~1.55 | 0.32 |
| SR626SW | 6.8 | 2.6 | 25-28 | ~1.55 | 0.39 |
The SR626SW battery lasts longer in most devices. It stores more energy than the SR621SW. If you wear your watch every day, you will see the SR626SW lasts longer. Both batteries give steady power, but the SR626SW usually works for more time.
Factors Affecting Performance
You want your battery to work well in your device. Many things can change how long your battery lasts:
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The right size is important. If you use the wrong battery, your watch may stop or lose power. Always check the size before buying.
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Both SR621SW and SR626SW use silver oxide. This type gives steady power and does not leak much.
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How you use your device matters. Devices that use more power will drain the battery faster.
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Where you keep your batteries is important. Store them in a cool, dry place. Keep them away from heat, water, and metal.
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Always use the battery your manual says to use. This helps your watch or device work well and keeps the battery safe.
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Very hot or cold places can make batteries die faster. Try to keep your watch or device at normal temperatures.
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Throw away old batteries the right way. This keeps your device and the environment safe.
Tip: To get the best battery life, always use the right battery and store it in a safe place. This helps your watch work well and your battery last longer.
Battery Safety Tips
Storage
You want your battery to last a long time. Storing it the right way keeps SR621SW and SR626SW batteries safe and ready. Here are some easy tips:
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Put your battery in a cool, dry place. Hot places make batteries lose power faster. If it gets 10°C hotter, the battery loses power almost twice as fast.
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Keep the air dry. Wet air can make batteries leak or rust. Try to store your battery at about 20°C (68°F) and 50% humidity.
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Use the box it came in or a sealed container with something that keeps out water. This stops water from getting to the battery.
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Do not keep your battery in attics or garages. These places can get too hot or wet.
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Make sure the battery ends are clean. Dirty ends can make the battery rust and not last as long.
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Keep your battery away from metal things. Metal can make the battery short out.
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Use a case or box to stop the battery from touching other things by accident.
Tip: Basements that are dry and not too hot or cold are good places to store batteries. Always keep batteries where kids and pets cannot reach them.
Disposal
When your battery is dead, you need to throw it away the right way. SR621SW and SR626SW batteries have silver oxide and are not safe for the trash. Here is how to get rid of them safely:
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Take your old battery to a place that collects dangerous waste. Many watch stores, electronics shops, and drugstores take batteries for recycling.
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Some companies and towns let you mail back batteries for recycling. This makes it easy to recycle your battery.
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Before you throw it away, put tape on the battery ends. This stops the battery from shorting out while being moved.
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Never burn or poke holes in your battery. This can let out bad chemicals and gases.
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Always follow your town’s rules for throwing away batteries. Recycling batteries the right way keeps bad stuff out of the ground and helps the planet.
Note: Throwing away batteries the right way keeps your town and the earth safe. Always look for recycling programs near you.
Picking the right sr626sw battery helps your watch work well. The table below shows how sr626sw battery and lr626 are different:
| Feature | sr626sw battery | lr626 |
|---|---|---|
| Diameter | 6.8 mm | 6.8 mm |
| Height | 2.6 mm | 2.6 mm |
| Capacity | 28 mAh | 28 mAh |
| Voltage | 1.55 V | 1.55 V |
You should use a good sr626sw battery or lr626 for best results. If you use the wrong sr626sw battery or lr626, your device may not work right. It could have weak contact, short battery life, or even break. Always check your manual before buying a new battery. Buy from sellers you trust. Be careful when you handle any sr626sw battery or lr626. Follow safe rules when you throw them away. Good sr626sw battery and lr626 choices keep your watch and other devices safe. Each time you change it, pick a good sr626sw battery or lr626 to help your device last longer.
FAQ
Can you use an SR626SW battery instead of an SR621SW?
You should not use an SR626SW battery in place of an SR621SW. The SR626SW is taller. It may not fit your device. Using the wrong size can damage your device or cause it to stop working.
How do you know which battery your device needs?
Check your device manual or look inside the battery compartment. You will see the battery code, such as SR621SW or SR626SW. Always match this code when you buy a new battery.
What happens if you use the wrong battery size?
If you use a battery that is too tall, it may not fit or could damage your device. If the battery is too short, it may lose contact and your device may not work.
Are SR626SW and LR626 the same?
The SR626SW is a silver-oxide battery. The LR626 is an alkaline battery. Both have the same size, but the SR626SW lasts longer and gives more steady power. Always use the type your device asks for.
How should you store spare watch batteries?
Store your batteries in a cool, dry place. Keep them away from heat, water, and metal objects. Use the original packaging or a small container to prevent short circuits.
Written by Jack Elliott from AIChipLink.
AIChipLink, one of the fastest-growing global independent electronic components distributors in the world, offers millions of products from thousands of manufacturers, and many of our in-stock parts is available to ship same day.
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