Overview
SR watch batteries are small, silver oxide-based button cells widely used in precision devices like watches and calculators. They are known for their stable voltage output and long lifespan, making them ideal for applications requiring consistent power over extended periods. Unlike alkaline batteries, SR batteries maintain a steady voltage until nearly depleted, ensuring reliable performance in timekeeping devices. The term 'SR' refers to the chemical composition, where 'S' stands for silver oxide and 'R' denotes the round (button) form factor. These batteries are available in standardized sizes (e.g., SR626, SR920) to fit various devices. Their compact size and high energy density make them a preferred choice for manufacturers of small electronics.
Physical and Chemical Properties
SR batteries utilize silver oxide (Ag2O) as the cathode and zinc as the anode, with an alkaline electrolyte (typically potassium hydroxide). This combination delivers a nominal voltage of 1.55V, which remains stable throughout most of the battery's discharge cycle. The cells are hermetically sealed to prevent leakage, a critical feature for sensitive electronics. Silver oxide batteries exhibit a high energy-to-volume ratio, outperforming lithium and alkaline counterparts in certain applications. They are also resistant to temperature fluctuations, functioning reliably in environments ranging from -10°C to 60°C. However, they are not rechargeable and must be disposed of properly to avoid environmental harm from silver content.
Main Applications
SR batteries are primarily used in watches, especially analog and digital models requiring precision and longevity. Their stable voltage ensures accurate timekeeping, even as the battery nears depletion. Other common applications include calculators, medical devices (e.g., hearing aids, glucose meters), and small electronic toys. In the B2B sector, SR batteries are often procured in bulk by watch manufacturers and electronics assemblers. Their standardized sizes and compatibility with international specifications (e.g., IEC codes) simplify integration into product designs. Specialty variants, such as mercury-free SR batteries, cater to eco-conscious markets.
Safety and Storage
SR batteries are generally safe but require proper handling to avoid risks. Short-circuiting can lead to overheating, so terminals should never contact conductive materials directly. Storage recommendations include keeping batteries in their original packaging until use and avoiding humid environments to prevent corrosion. Disposal of SR batteries must comply with local regulations due to their silver content. Many regions mandate recycling through designated programs to recover valuable metals and prevent environmental contamination. Businesses procuring large quantities should partner with certified waste management providers for compliant disposal solutions.
B2B Procurement Guide
When sourcing SR batteries for industrial or commercial use, buyers should prioritize suppliers with ISO certification to ensure quality and consistency. Key considerations include battery size (e.g., SR626, SR916), voltage requirements, and shelf life (typically 2–5 years). Bulk orders often reduce per-unit costs, but storage conditions must align with manufacturer guidelines to preserve performance. Procurement teams should also verify compliance with regional regulations, such as RoHS and REACH, particularly for mercury-free variants. Partnering with suppliers offering traceability and batch testing can mitigate risks of counterfeit products. For high-volume applications, long-term contracts with negotiated pricing are advisable.
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