**Comprehensive Guide to 389/390 Silver Oxide Button Batteries**

**Introduction**

Silver oxide button batteries, specifically the 389/390 model, are widely used in various electronic devices due to their compact size, high energy density, and long shelf life. This guide provides a detailed examination of 389/390 silver oxide button batteries, covering their specifications, applications, advantages, and precautions.

**Specifications**

• Nominal Voltage: 1.55 V
• Nominal Capacity: 180 mAh (IEC Standard)
• Diameter: 9.5 mm
• Height: 3.6 mm
• Weight: Approx. 1 g
• Shelf Life: 5+ years

**Applications**

389/390 silver oxide button batteries are commonly found in the following devices:

• Watches
• Calculators
• Key fobs
• Hearing aids
• Medical devices
• Toys
• Remote controls

**Benefits**

• Stable Voltage Output: Silver oxide batteries deliver a consistent voltage over their discharge period, ensuring reliable performance.
• High Energy Density: These batteries pack a significant amount of energy into their compact size, providing long-lasting power.
• Long Shelf Life: With a shelf life of more than 5 years, silver oxide batteries can be stored for extended periods without losing their viability.
• Wide Temperature Range: They can operate in a wide temperature range (-20°C to +60°C), making them suitable for various environments.
• Low Internal Resistance: Silver oxide batteries have low internal resistance, which reduces voltage drop during high-current applications.

**Precautions**

• Avoid Short Circuits: Short-circuiting a silver oxide battery can cause overheating and damage.
• Proper Storage: Store batteries in a cool, dry place to maximize their shelf life.
• Dispose of Safely: Silver oxide batteries should be disposed of properly in designated recycling centers.

**Common Mistakes to Avoid**

• Using Incompatible Devices: Ensure that the device you are powering matches the voltage and output requirements of the 389/390 battery.
• Recharging: Attempting to recharge a silver oxide battery can be dangerous and may cause damage.
• Mixing Different Batteries: Do not mix batteries of different chemistries or brands in the same device.
• Inappropriate Handling: Avoid bending, puncturing, or crushing the battery, as this can result in leakage or damage.

**Why They Matter**

389/390 silver oxide button batteries play a crucial role in powering everyday electronic devices that rely on reliable, long-lasting energy sources. Their widespread use in watches, hearing aids, and medical implants demonstrates their significance in providing uninterrupted power to essential devices.

**Comparison of Pros and Cons**

Pros:

• High energy density
• Stable voltage output
• Long shelf life
• Wide temperature range
• Low internal resistance

Cons:

• Higher cost than alkaline batteries
• Not rechargeable
• Environmental concerns with disposal

**Stories and Lessons Learned**

Story 1: A senior citizen's pacemaker was malfunctioning due to a low battery. The replacement of a single 389/390 silver oxide battery restored the pacemaker's functionality and ensured the patient's well-being.
Lesson: Regular battery maintenance is essential for critical medical devices.

Story 2: A watch enthusiast was frustrated by the frequent replacement of alkaline batteries in their prized timepiece. Switching to 389/390 silver oxide batteries extended the battery life significantly, providing years of uninterrupted timekeeping.
Lesson: Choosing the right battery can enhance device performance and longevity.

Story 3: A toy manufacturer faced safety concerns due to overheating batteries in their products. By replacing alkaline batteries with 389/390 silver oxide batteries, they reduced the risk of temperature-related hazards.
Lesson: Battery selection can have significant safety implications.

**Table 1: Specifications and Physical Dimensions of 389/390 Silver Oxide Button Batteries**

**Table 2: Shelf Life and Discharge Characteristics of 389/390 Silver Oxide Button Batteries**

**Table 3: Equivalents and Alternative Models of 389/390 Silver Oxide Button Batteries**