Choosing between an A76 and 357 button cells can directly impact your device’s accuracy, runtime, and reliability. Though identical in size, their chemistry and performance differ significantly. This article breaks down specifications, discharge behavior, and best applications, helping you select the right battery for calculators, watches, medical tools, or precision electronics with confidence.
A76 Battery Overview
The A76 is an alkaline button cell battery with a nominal voltage of 1.5V. Compact in size (about 11.6 mm diameter × 5.4 mm thickness), it is designed for small, portable electronics. Its chemistry uses manganese dioxide (MnO₂) as the cathode and zinc as the anode, providing reliable energy at a low cost. With proper storage at room temperature, the A76 can retain usable charge for up to 5 years. Its affordability and ability to handle moderate current loads make it one of the most common choices for everyday consumer devices.
Understanding 357 Battery
The 357 is a silver oxide button cell battery with a nominal voltage of 1.55V. Slightly higher in energy density compared to alkaline types, it provides more stable voltage throughout discharge. Measuring the same size as the A76 (11.6 mm × 5.4 mm), it fits in the same devices but offers improved performance for sensitive electronics. The chemistry uses silver oxide as the cathode and zinc as the anode, resulting in low self-discharge and longer runtime. The 357 is interchangeable with other codes such as SR44, LR1154, AG13, and EPX76, making it a versatile replacement option.
Technical Specifications of A76 and 357
The A76 and 357 are physically identical but differ in chemistry, performance, and runtime.
| Parameter | A76 (Alkaline) | 357 (Silver Oxide) |
|---|---|---|
| Chemical System | Manganese Dioxide (MnO₂) | Silver Oxide (Zn/Ag₂O) |
| Designation | ANSI/NEDA 1166A, IEC-LR44 | ANSI-1131SO, IEC-SR44 |
| Nominal Voltage | 1.5 V | 1.55 V |
| Typical Capacity | 175 mAh (to 0.9V) | 150 mAh (to 1.2V) |
| Load Test | 6.8 kΩ drain at 21°C | 6.8 kΩ drain at 21°C |
| Weight | 1.85 g | 2.3 g |
| Volume | 0.57 cm³ | 0.57 cm³ |
| Impedance (40 Hz) | 5–15 Ω | 5–15 Ω |
While capacity ratings may seem similar, the 357 maintains voltage more consistently across its life, making it better for precision electronics.
Internal Diagram of A76 and 357 Battery
| Parameter | A76 (Alkaline) | 357 (Silver Oxide) |
|---|---|---|
| Nominal Voltage | 1.5 V | 1.55 V |
| Anode Material | Zinc (Zn, gel form) | Zinc (Zn, gel form) |
| Cathode Material | Manganese Dioxide (MnO₂) | Silver Oxide (Ag₂O) |
| Discharge Curve | Sloping – voltage drops gradually | Flat – voltage remains stable until near depletion |
| Energy Density | Moderate | Higher |
| Cost | Lower, more affordable | Higher due to silver content |
| Performance | Reliable for basic electronics | Excellent stability for precision devices |
| Advantages | Cost-effective, widely available, good general-purpose cell | Stable output, low self-discharge, ideal for accuracy-demanding devices |
| Limitations | Voltage drop can cause issues in sensitive electronics | More expensive, shorter shelf life in absolute years |
Dimensions of A76 and 357 Battery
| Parameter | A76 Battery Dimensions | 357 Battery Dimensions |
|---|---|---|
| Diameter (max) | 11.60 mm (0.457 in) | 11.60 mm (0.457 in) |
| Diameter (min) | 11.25 mm (0.443 in) | 11.25 mm (0.443 in) |
| Height (max) | 5.40 mm (0.213 in) | 5.50 mm (0.217 in) |
| Height (typical) | 4.90 mm (0.193 in) | 4.83 mm (0.190 in) |
| Height (min) | 3.80 mm (0.150 in) | 4.57 mm (0.180 in) |
| Radius (R1.5) | 1.5 mm (0.059 in) | 1.5 mm (0.059 in) |
| Maximum permissible deflection from flat | 0.25 mm (0.010 in) | 0.25 mm (0.010 in) |
| Minimum reference (top of gasket / crimp edge) | 0.13 mm (0.005 in) | 0.13 mm (0.005 in) |
| Additional reference height | – | 7.20 mm (0.283 in) typical |
Applications of A76 and 357
A76 (LR44)
Best suited for cost-sensitive devices where occasional or short-term power is enough:
• Calculators – quick, low-drain tasks
• Digital thermometers – household accuracy
• Toys and novelty gadgets – affordable replacements
• Laser pointers – compact and easy to swap
• Small desk or travel clocks – steady low-power operation
357 (SR44):
Preferred for precision devices that require stable voltage and long runtime:
• Wristwatches – accurate timekeeping
• Hearing aids – consistent daily use
• Glucose monitors – reliable medical readings
• Measuring instruments – voltage stability for accuracy
• Diagnostic equipment – dependable power in professional use
Discharge Characteristics of A76 and 357 Battery
| Aspect | 76 (Alkaline) Discharge Curve | 357 (Silver Oxide) Discharge Curve |
|---|---|---|
| Shape | Sloping curve. Voltage steadily drops with time; slope becomes steeper near end of life. | Flat/plateau-like curve. Voltage remains nearly constant until sharp drop near depletion. |
| Starting Voltage | \~1.55–1.6 V (fresh) | \~1.55 V |
| Voltage Behavior | Gradual decrease throughout discharge cycle | Almost constant (1.55 → 1.45 V) for most of service life |
| Service Hours | \~915 hrs down to 0.9 V (low-voltage devices) \~734 hrs down to 1.2 V (stable-operation devices) | Similar or slightly longer than alkaline, with much more stable output |
| Implication | Suitable for devices tolerant of dropping voltage (toys, calculators, clocks). Less ideal for precision electronics. | Excellent for precision devices (watches, hearing aids, glucose monitors, medical instruments). Maintains full performance until near end of life. |
Leading Manufacturers of A76 and 357 Battery
• Energizer® – Based in St. Louis, Energizer is one of the most recognized producers of A76 and 357 batteries. With distribution in over 150 countries, the brand is widely trusted for consistent performance and long shelf life across both everyday and precision applications.
• Duracell® – Another global leader, Duracell manufactures both alkaline (A76/LR44) and silver oxide (357/SR44) cells. Known for strong brand recognition and broad availability, Duracell products are a common choice in retail and industrial markets.
• Renata (a Swatch Group brand) – Specializing in watch and precision electronics batteries, Renata is a major supplier of silver oxide cells like the 357. Its focus on reliability makes it especially popular in timepieces and medical devices.
Environmental Impact and Recycling
• 357 (Silver Oxide): These cells contain silver and trace heavy metals that must be handled carefully at end-of-life. Controlled recycling not only prevents harmful substances from entering the environment but also enables the recovery of valuable silver for reuse in industry.
• A76 (Alkaline): Modern alkaline batteries are mercury-free and therefore safer than older formulations. However, if discarded in household waste, they can still release compounds that contaminate soil and groundwater. Recycling remains the recommended disposal method to minimize impact.
Across many regions, specialized battery collection programs are in place. Drop-off points are often available in supermarkets, electronics retailers, hospitals, and municipal recycling facilities, making responsible disposal convenient. Public awareness campaigns also encourage separating used button cells from general waste streams, helping reduce environmental damage and supporting sustainable material recovery.
Storage and Shelf-Life Tips
To maximize battery performance and reduce waste, proper storage is a must:
• Keep unused cells in their original packaging or in a protective case to prevent accidental contact and shorting.
• Store in a cool, dry place, away from direct sunlight, heaters, or areas with high humidity, as excessive heat or moisture accelerates chemical degradation.
• Avoid storing batteries in metal containers where terminals could touch conductive surfaces.
• Do not mix new and partially used cells in a device or storage container, as voltage differences can cause leakage or reduced overall performance.
• Check stored batteries periodically for any signs of corrosion or swelling, and dispose of affected cells promptly.
Typical shelf life under proper storage conditions:
• A76 (Alkaline): Up to ~5 years, offering dependable standby use.
• 357 (Silver Oxide): Around ~4 years, but with superior retention of stable voltage, making them more reliable for precision devices even after long storage.
Conclusion
While the A76 delivers cost-effective power for everyday devices, the 357 excels in stability and precision where accuracy is needed. Understanding their differences ensures longer runtime, reliable performance, and better device care. Whether replacing a watch, thermometer, or medical monitor, this guide helps you make the smarter battery choice for lasting results.
Frequently Asked Questions [FAQ]
Can I replace an A76 battery with a 357 battery?
Yes. Both share the same dimensions, so they fit the same devices. However, the 357 (silver oxide) provides more stable voltage and longer runtime than the A76 (alkaline), making it the better option for precision electronics.
Why does a 357 battery last longer than an A76?
The 357 uses silver oxide chemistry, which maintains nearly constant voltage throughout its life. In contrast, the A76’s alkaline chemistry drops voltage gradually, leading to shorter effective runtime in sensitive devices.
Which devices work best with an A76 battery?
A76 batteries are best for low-drain, cost-sensitive devices such as calculators, toys, thermometers, and small clocks. These devices tolerate the gradual voltage drop of alkaline cells without major performance issues.
Are A76 and LR44 the same battery?
Yes. The A76 is often cross-labeled as LR44. These designations both refer to the same alkaline button cell type. The 357, however, is a silver oxide cell, even though it can fit in the same slot.
How should I dispose of A76 and 357 batteries?
Both must be recycled through designated collection points. The 357 contains silver and trace metals, making controlled recycling useful. While A76 batteries are mercury-free, improper disposal can still harm the environment.