Overview
The R20 battery, also known as a D-cell battery, is one of the largest standard cylindrical battery sizes. It's classified as a primary (non-rechargeable) battery with a nominal voltage of 1.5 volts. The R20 designation follows the IEC standard naming system, where 'R' indicates round shape and '20' denotes the size category. First introduced in the early 20th century, R20 batteries were among the first standardized dry cell batteries. They remain popular today due to their reliability in low-drain applications and relatively low cost compared to other battery types. The size measures approximately 61.5mm in height and 34.2mm in diameter.
Product Features
R20 batteries are characterized by their cylindrical shape and standardized dimensions. They typically use either zinc-carbon or alkaline chemistry, with alkaline versions offering superior performance and longer shelf life. The zinc-carbon variants are more economical but have lower capacity and poorer performance in cold temperatures. Key technical specifications include a nominal voltage of 1.5V and capacities ranging from 8,000 to 12,000 mAh for alkaline versions. The batteries feature a positive terminal nub and flat negative terminal, with the positive end slightly protruding. Their robust construction makes them resistant to leakage when properly stored and used within recommended parameters.
Main Uses
R20 batteries find application in various low to moderate drain devices where long battery life is required. Common applications include flashlights, portable radios, toys, and some medical devices. Their large size makes them ideal for devices that require extended operation between battery changes. In industrial settings, R20 batteries are often used in emergency lighting systems, safety equipment, and some types of instrumentation. Their reliability and wide availability make them a preferred choice for applications where battery replacement needs to be infrequent. However, they are being gradually replaced by rechargeable alternatives in some applications due to environmental concerns.
Culture and Development
The R20 battery has a rich history dating back to the early 1900s when the first dry cell batteries were standardized. Its development paralleled the growth of portable electrical devices in the 20th century. The 'D-cell' size became particularly popular during World War II for military applications. In recent decades, while the basic design has remained unchanged, improvements in chemistry have significantly enhanced performance. Modern alkaline R20 batteries offer several times the capacity of their early zinc-carbon counterparts. The battery has become a cultural icon of sorts, representing the standard for large, household batteries in many parts of the world.
B2B Procurement Guide
For B2B buyers, R20 batteries are typically available in bulk quantities ranging from 100 to several thousand units. Key procurement considerations include determining the appropriate chemistry (zinc-carbon for cost-sensitive applications, alkaline for better performance), verifying shelf life (typically 2-5 years for alkaline), and ensuring proper storage conditions. Major manufacturers include Duracell, Energizer, Panasonic, and various regional brands. When sourcing, consider certifications like IEC 60086, RoHS compliance, and any industry-specific requirements. Packaging options vary from blister packs for retail distribution to bulk boxes for industrial use. For large volume purchases, negotiating pricing based on order quantity and delivery schedule can yield significant savings.
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