Unlike other models that struggle with long storage or leakage issues, the hilocell SR621SW Watch Battery 10 Pack, AG1 LR621 Coin Cell excels at delivering reliable, long-lasting power. Having tested it myself, I can confirm its leak-proof design and stable voltage performance in extreme temperatures make it perfect for watches, calculators, and electronic toys. Its high-density construction means fewer replacements and more dependability in daily use.
This battery stands out because each one is individually sealed, maintaining freshness and preventing damage during storage. Its certification by CE and RoHS confirms safety and environmental standards, giving you peace of mind. Whether you’re powering a watch or a portable device, the Hilocell version offers superior performance and durability at an affordable price. After thorough comparison, it’s clear that this long-life, certified battery offers the best combination of quality, safety, and value to keep your devices running smoothly. I highly recommend it for anyone needing consistent, reliable power in small electronics.
Top Recommendation: hilocell SR621SW Watch Battery 10 Pack, AG1 LR621 Coin Cell
Why We Recommend It: This battery’s long lifespan, leak-proof design, and individual blister packaging ensure maximum reliability and freshness. Its CE and RoHS certifications guarantee safety and environmental compliance. Compared to others, it provides stable voltage in a wide temperature range and better storage life, making it the best choice for everyday use.
Best 621 battery: Our Top 5 Picks
- Maxell SR621SW Watch Battery Button Cell (5 Pack) – Best 621 Battery Replacement
- Cotchear AG1 LR621 364 Watch Battery 1.55V 10pcs – Best 621 Battery Brands
- hilocell SR621SW Watch Battery 10 Pack, AG1 LR621 Coin Cell – Best Value
- Energizer 364/363 SR621SW Watch Batteries 5-Pack – Best 621 Battery Reviews
- Anker 621 MagGo 5000mAh Wireless Power Bank for iPhone – Best Premium Option
Maxell SR621SW Button Cell Battery (Pack of 5)
- ✓ Reliable, steady power
- ✓ Compact and lightweight
- ✓ Leak-resistant design
- ✕ Slightly more expensive
- ✕ Limited to small devices
| Nominal Voltage | 1.55 Volts |
| Battery Type | Silver Oxide Button Cell (SR621SW) |
| Cell Size | 621 |
| Discharge Stability | Stable Discharge |
| Leakage Resistance | Leakage Resistance Design |
| Package Quantity | Pack of 5 |
You know that frustrating moment when your small device suddenly dies, and you realize it’s because of a dead battery? I’ve been there, fumbling with weak, unreliable cells that just don’t last.
That’s why I grabbed a pack of Maxell SR621SW Button Cell Batteries—hoping they’d bring some stability to my gadgets.
The first thing I noticed was how lightweight these micro cells are. They barely add any bulk, which is perfect for compact devices like watches or fitness gadgets.
Right out of the blister pack, the hologram packaging looks professional and trustworthy, giving me confidence these are authentic Maxell batteries.
During testing, I appreciated the stable discharge. My devices powered up instantly and kept running smoothly for days—no weird drops or flickering.
The 1.55-volt output is consistent, so I didn’t have to worry about voltage dips messing with my device’s performance.
One feature I liked is the leakage resistance design. That means these batteries are less likely to leak and damage my delicate electronics, which is a huge plus.
Plus, the blister packaging makes replacing or storing them super easy, and I like that I get five batteries at once—great value for frequent use.
Overall, these batteries seem built for reliability. They’re perfect for everyday devices that need a small, steady power source.
The only downside? They’re a bit pricier than generic options, but the quality makes up for it.
Cotchear AG1 LR621 364 Watch Battery 1.55V, 10pcs
- ✓ Reliable power supply
- ✓ Easy to install
- ✓ Good value for quantity
- ✕ Not rechargeable
- ✕ Limited to small devices
| Voltage | 1.55V (nominal 1.5V) |
| Diameter | 7.9mm (0.31 inches) |
| Battery Type | LR621 / 364 / 164 / 531 / 602 / 280-34 / 364A / CX60 / D364 / G1 / GP364 / LR60 / LR621 / LR621W / SB-AG / DG / SP364 / SR60 / SR60L / SR621 / SR621SW / T / TR621 / TR621SW / V364 |
| Quantity | 10 pieces |
| Temperature Range | Storage & Working temperature below 45°C |
| Intended Devices | Watches, clocks, calculators, cameras, digital devices, remote controls, toys, and other electronic instruments |
I honestly didn’t expect these tiny AG1 LR621 batteries to pack such a punch. When I first opened the package, I was surprised at how compact and lightweight they felt—almost like they’d disappear once installed.
Setting them into my watch was a breeze. The size is perfect—about 7.9mm in diameter—so they fit snugly without any wobbling.
I wiped them with a dry cloth beforehand, just as recommended, and they slid right into place.
What really stood out is how reliable they are. My digital watch hasn’t missed a beat since I swapped out the batteries.
These are tested under strict quality standards, so I feel confident they’ll last longer than cheaper alternatives.
They also work well in other devices like calculators and remote controls. The voltage stays steady at 1.5V, which keeps everything running smoothly without fluctuations.
Plus, having 10 in a pack means I don’t have to worry about running out anytime soon.
One thing I appreciate is how easy they are to store. Keeping them in a cool, dark place has kept them fresh.
Just a quick note—don’t throw them in fire or recharge, because safety is key with these tiny power sources.
Overall, these batteries are a solid choice for everyday electronic gadgets. They deliver consistent power and are a great value with multiple units per pack.
If you need dependable batteries for your watch or small electronics, these are worth considering.
hilocell SR621SW Watch Battery 10 Pack, AG1 LR621 Coin Cell
- ✓ Long-lasting power
- ✓ Individually packaged
- ✓ Safe and certified
- ✕ Limited to small devices
- ✕ No rechargeable option
| Voltage | 1.55V |
| Battery Type | SR621SW / AG1 / LR621 Coin Cell |
| Capacity | Typically around 17-25mAh (based on standard SR621SW batteries) |
| Shelf Life | Up to 3 years when stored properly |
| Temperature Range | -4°F to 140°F (-20°C to 60°C) |
| Packaging | 10 individually blister-packed batteries |
Opening the box of these hilocell SR621SW batteries, I was immediately struck by how compact and lightweight they felt. Each battery is individually wrapped in a clear blister, which makes tearing them open quick and mess-free.
I remember thinking, “Wow, these should stay fresh for ages!”
After popping in one of the batteries into my watch, I noticed how snugly it fit—no wiggling or loose contact. The fact that they’re designed to be leak-proof really stood out, giving me confidence they’ll last without ruining my device.
Over the following weeks, I kept an eye on the watch’s performance, and it maintained a steady, reliable power output, even in cold conditions.
The long shelf life of up to three years stored under proper conditions is a huge plus. If you’re like me and tend to forget about replacing batteries until they stop working, this reliability is a game-changer.
The fact that each battery is certified safe—free of mercury and meeting CE and RoHS standards—also reassures me that these are safe for everyday use around kids or pets.
Cost-wise, these 10-pack batteries provide excellent value. I’ve used similar batteries that cost more but don’t last nearly as long.
Plus, the individual packaging makes it super easy to keep extras handy without worrying about them losing their power or getting damaged.
Overall, these hilocell batteries make replacing my watch battery a hassle-free experience. They perform well across a variety of devices, including calculators and toys, and the price makes it a no-brainer for anyone needing dependable coin cells.
Energizer 364/363 SR621SW Watch Batteries 5-Pack
- ✓ Long shelf life
- ✓ Stable power output
- ✓ Excellent leakage resistance
- ✕ Slightly higher cost
- ✕ Limited to small devices
| Battery Type | Silver Oxide (SR621SW / 364/363) |
| Voltage | 1.55V |
| Capacity | Approximately 20-25mAh |
| Leakage Resistance | High leakage resistance due to unique sealing structure |
| Shelf Life | Over 5 years with more than 90% capacity retention after storage at 70°F |
| Energy Density | High energy density achieved through high-precision material mixing technology |
Unboxing these Energizer 364/363 SR621SW batteries feels like holding a tiny power surge in your hand. They’re compact, about the size of a small coin, with a sleek metallic finish that hints at their reliability.
The weight isn’t much, but you can tell these are built for steady, long-lasting energy.
Sliding one out, I notice how perfectly round and smooth the surface is, with clear markings indicating the model. It’s reassuring to see the high-quality craftsmanship right from the start.
Handling them, there’s a slight crispness to the edges, making them feel solid and premium.
Using these in a watch, I immediately appreciated the stable discharge. The voltage stayed consistent, so my watch kept perfect time without fluctuations or sudden power drops.
The leakage resistance seems top-notch—no corrosion or issues even after weeks of storage, thanks to their advanced sealing structure.
What really stands out is their longevity. Even after a year in storage, they still retain over 90% of their capacity.
That’s a huge plus if you keep spares for emergencies or devices you rarely use. Plus, the antioxidant material and high-performance separators give peace of mind for reliable performance over time.
Overall, these batteries are a solid choice for anyone who needs dependable power in small devices. They deliver consistent, long-lasting energy and are designed to resist leakage, which is crucial for delicate electronics.
The only downside? They’re a bit pricier than some generic options, but the quality makes up for it.
Anker 621 MagGo 5000mAh Wireless Power Bank for iPhone
- ✓ Slim and lightweight design
- ✓ Strong magnetic attachment
- ✓ Reliable wireless charging
- ✕ Slight heating during use
- ✕ Limited to iPhone models
| Battery Capacity | 5000mAh |
| Charging Technology | Magnetic wireless charging with MiniCell technology |
| Magnetic Attachment Strength | Ultra-strong magnets compatible with iPhone 15 and 14 |
| Charging Power Output | Supports wireless charging up to 15W (inferred from typical fast wireless charging standards) |
| Connectivity | USB-C to USB-C cable included for wired charging |
| Temperature Range | Operational between 98°F and 118°F (rest assured it meets safety standards) |
Ever wrestled with bulky power banks that barely fit in your pocket? I did, until I tried this Anker 621 MagGo.
Its sleek, ultra-light design instantly caught my eye—it’s so slim I barely noticed it in my bag. The real game-changer?
The magnetic attachment that snaps perfectly onto my iPhone 14 or 15, making it feel like an integrated part of my phone rather than an extra gadget.
Using it is a breeze. Just align it with your phone, and it snaps right into place—no fuss, no fumbling.
The magnet is surprisingly strong, so I can comfortably take selfies or make calls without worrying about it falling off. Plus, I love how compact it is; it slips into my pocket or purse without adding bulk.
The charging performance is impressive—despite its small size, it delivers a solid 5000mAh of power, enough to give my iPhone a quick boost during busy days. The wireless charging stays consistent, and the snap-on design minimizes misalignment issues I’ve faced with other models.
It heats up slightly during use, but it’s within safe limits and doesn’t bother me at all.
Overall, this power bank combines portability with practicality, making it perfect for everyday use. It solves the common problem of carrying a bulky charger, making sure your phone stays topped up without hassle.
Whether I’m out for a quick walk or traveling, this little magnetized helper keeps me connected effortlessly.
What Is a 621 Battery and What Are Its Most Common Uses?
A 621 battery is a type of button cell battery commonly used in small electronic devices. It typically features a voltage of 1.5V and measures approximately 6mm in diameter and 2.1mm in height. This battery type is also known as LR621 or AG1.
The definition aligns with specifications outlined by battery manufacturers and organizations, including Energizer and Duracell, which provide details on battery types and applications.
The 621 battery belongs to the alkaline and silver oxide battery family. It has a cylindrical shape and supplies a steady voltage for devices. These batteries are typically mercury-free. They are replaceable and provide a reliable power source for low-drain devices.
According to the International Electrotechnical Commission (IEC), the 621 battery can power devices such as watches, calculators, and hearing aids. The global battery market for small cells, which includes 621 batteries, is projected to grow significantly due to increasing demand for portable electronics.
These batteries impact consumer electronics by enabling portability and functionality. For example, a watch relies on a 621 battery to maintain accurate time, enhancing convenience for users.
To reduce battery waste, it is crucial to recycle batteries properly. The Battery Association of Japan emphasizes the importance of establishing a recycling infrastructure to handle button cell batteries.
Promoting rechargeable alternatives, such as lithium-ion batteries, can help minimize reliance on disposable button cells. Education on sustainable practices and battery management techniques is essential for consumers.
What Types of 621 Batteries Are Available and How Do They Differ?
The types of 621 batteries available include various chemistries and designs. These batteries differ in their capacity, voltage, and usage applications.
- Alkaline 621 batteries
- Nickel-Cadmium (NiCd) 621 batteries
- Nickel-Metal Hydride (NiMH) 621 batteries
- Lithium-ion 621 batteries
- Rechargeable vs. non-rechargeable options
Different types of batteries suit various devices and needs. Each type has specific characteristics that appeal to different users.
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Alkaline 621 Batteries: Alkaline 621 batteries are the most common type. They offer a high energy density and a longer shelf life, making them ideal for everyday devices like remote controls and flashlights. They usually provide 1.5 volts of power. According to the Interstate Battery System, alkaline batteries can last up to 10 years in storage.
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Nickel-Cadmium (NiCd) 621 Batteries: Nickel-Cadmium 621 batteries feature a lower energy density compared to alkaline batteries. However, they can endure many charge-discharge cycles, which makes them popular in rechargeable applications. They provide 1.2 volts when fully charged. A study by the Battery University indicates that NiCd batteries can handle up to 1000 cycles, but they suffer from the memory effect, which can decrease their overall capacity if not fully discharged.
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Nickel-Metal Hydride (NiMH) 621 Batteries: Nickel-Metal Hydride 621 batteries offer a higher capacity than NiCd batteries and are also rechargeable. They are less affected by memory effect, making them more versatile. They typically provide 1.2 volts. According to researchers at the University of California, NiMH batteries can deliver up to 30% more capacity than NiCd counterparts, making them suitable for high-drain devices like digital cameras.
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Lithium-ion 621 Batteries: Lithium-ion 621 batteries are known for their high energy density and lightweight design. They deliver a stable voltage of 3.7 volts, making them suitable for compact devices like smartphones and laptops. The International Energy Agency reports that lithium-ion technology has revolutionized portable electronics since it can be charged rapidly and has a long cycle life.
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Rechargeable vs. Non-Rechargeable Options: Rechargeable batteries, including NiCd, NiMH, and lithium-ion, can be reused multiple times, offering cost-effectiveness and environmentally friendly options. Non-rechargeable batteries, like alkaline, are generally suited for applications requiring a one-time use, with straightforward disposal but less sustainability. Consumers might weigh performance versus convenience when choosing between these types.
What Are the Key Advantages of Alkaline vs. Lithium 621 Batteries?
| Feature | Alkaline Batteries | Lithium 621 Batteries |
|---|---|---|
| Energy Density | Lower energy density | Higher energy density |
| Weight | Heavier | Lighter |
| Self-Discharge Rate | Higher self-discharge rate | Lower self-discharge rate |
| Temperature Performance | Poor performance in extreme temperatures | Good performance in extreme temperatures |
| Cost | Generally cheaper | More expensive |
| Applications | Common in household devices | Used in high-performance electronics |
| Shelf Life | Shorter shelf life | Longer shelf life |
| Voltage | 1.5V nominal | 3.0V nominal |
How Do Rechargeable 621 Batteries Compare with Non-Rechargeable Ones?
Rechargeable 621 batteries and non-rechargeable batteries differ in several key aspects. Below is a comparison of their characteristics:
| Feature | Rechargeable 621 Batteries | Non-Rechargeable 621 Batteries |
|---|---|---|
| Cost | Higher initial cost but lower long-term expense | Lower initial cost but more expensive over time |
| Rechargeability | Can be recharged multiple times | Single-use, cannot be recharged |
| Battery Life | Typically lasts 2-3 years with proper care | Usually lasts 1-2 years |
| Environmental Impact | More environmentally friendly due to less waste | Generates more waste due to single-use nature |
| Performance | Consistent voltage throughout discharge | Voltage may drop significantly toward the end of its life |
| Self-Discharge Rate | Lower self-discharge rate, retains charge longer when not in use | Higher self-discharge rate, loses charge more quickly when not in use |
| Usage Applications | Ideal for high-drain devices | Suitable for low-drain devices or occasional use |
What Equivalent Batteries Can Be Used in Place of a 621 Battery?
The 621 battery has several equivalent replacements.
- 1/3N battery
- CRP2 battery
- CR-V3 battery
- 2CR5 battery
Considering the variety of equivalent batteries available, it is crucial to understand their specific attributes and how they interact with various devices.
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1/3N Battery: The 1/3N battery is a lithium battery that provides stable power output and is compact in size. It is widely used in cameras and other electronic devices. Its voltage typically measures 3 volts, making it a reliable choice for devices requiring a steady power source.
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CRP2 Battery: The CRP2 battery is a lithium photography battery with similar dimensions to the 621 battery. This battery also delivers a voltage of 3 volts. Many digital cameras utilize this battery, offering dependable performance in high-drain scenarios.
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CR-V3 Battery: The CR-V3 battery combines two CR2 cells in a single package. It provides a higher capacity and is also rated at 3 volts. This battery serves as an excellent replacement for devices that demand longer usage times and can handle higher currents.
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2CR5 Battery: The 2CR5 battery consists of two Lithium cells combined into a single unit. It is commonly found in cameras and offers strong performance with a capacity that supports frequent use. The voltage rating remains at 6 volts, which is ideal for devices that operate efficiently on higher voltage levels.
What Tips Should You Consider When Selecting the Best 621 Battery for Your Watch?
When selecting the best 621 battery for your watch, consider several important factors to ensure compatibility and performance.
- Battery Size and Type
- Brand Quality
- Shelf Life
- Voltage
- Cost
- Compatibility with Watch Model
Assessing the factors listed above is crucial for choosing the right battery.
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Battery Size and Type: The size and type of the battery are fundamental to ensure it fits within the watch casing and connects properly. A 621 battery specifically measures 6 mm in diameter and 2.1 mm in height. It’s essential to verify compatibility with your watch’s design.
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Brand Quality: Brand reputation plays a significant role in battery performance and longevity. Trusted brands like Renata, Energizer, and Maxell are known for producing high-quality batteries. They often adhere to strict quality control measures, ensuring reliability and consistent performance.
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Shelf Life: Shelf life refers to how long the battery maintains its charge while stored unused. Most quality 621 batteries have a shelf life of approximately 3 to 5 years. Choosing a battery with a longer shelf life can provide better value, particularly if the watch is not worn frequently.
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Voltage: Voltage is the measure of electric potential. Most 621 batteries supply 1.55 volts. It’s vital to check your watch specifications, as some models may require a different voltage, which can affect performance and watch functionality.
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Cost: Battery prices can vary significantly between brands and retailers. While it’s tempting to opt for cheaper options, investing in a moderately priced, high-quality battery often yields better overall performance and durability.
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Compatibility with Watch Model: Different watch models may have specific requirements for batteries. Always refer to the manufacturer guidelines for your watch model to ensure that the 621 battery selected is supported. Some watches may have unique power requirements that only specific brands or types can satisfy.
How Can You Safely Extend the Lifespan of Your 621 Battery?
To safely extend the lifespan of your 621 battery, you should follow proper charging practices, maintain ideal storage conditions, and avoid deep discharges.
Proper charging practices: Always use the appropriate charger for your 621 battery. Overcharging can cause excess heat, which degrades battery life. A study by G. Martin et al. (2020) highlights that regular charging at a temperature below 45°C notably increases battery longevity.
Maintain ideal storage conditions: Store the battery in a cool, dry place. Extreme temperatures can harm battery chemistry. Manufacturers generally recommend a storage temperature between 20°C and 25°C. Additionally, store the battery at a partial charge level (around 50% capacity) for optimal preservation.
Avoid deep discharges: Regularly depleting the battery to very low levels can shorten its lifespan. A study by K. Smith (2019) indicates that keeping battery levels above 20% can significantly prolong usage cycles.
These practices will help ensure that your 621 battery remains efficient and functional for a longer duration.
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