D Batteries

D batteries, also known as D cell batteries, are a standard size of dry cell battery that is used for higher-drain power applications. Its IEC name is LR20 and is often referred to as 'Flashlight Batteries', due to their use in large torches which require long-lasting power and performance.

A D size battery measures approximately 61.5 mm in length and 34.2 mm in diameter, making it significantly larger than AA or C batteries. This larger size allows D type batteries to store more energy and provide a steady, long-lasting power supply for heavy-duty devices.

They are available in different chemistries, with alkaline D cell batteries being the most common for household use, and lithium D cell batteries serving critical or industrial applications. To learn more about D batteries and for help choosing the best battery for your devices or equipment, please see our D batteries guide.

Benefits of D Batteries

D type batteries are preferred for high-drain applications because of their strength, capacity, and reliable output. Some of the main benefits include:

• High Energy Capacity: With their large size, D batteries can hold substantial amounts of energy, making them well-suited for high-draining devices.
• Extended Shelf Life: Both alkaline and lithium D cell batteries can remain functional for years in storage, making them reliable for emergency kits or devices that see occasional use.
• Wide Versatility: Offered in disposable and rechargeable formats, D batteries can meet diverse requirements across household, professional, and industrial applications.
• Consistent Reliability: D type batteries deliver a steady voltage output, reducing the risk of power drops and keeping devices running smoothly for extended periods.
• Widely Available: D batteries are typically readily available across hardware stores.

Types of D Batteries

D size batteries come in a few main variations, each designed to suit different power requirements and environments. The type of D battery you choose can directly affect the performance, runtime, and overall reliability of your device.

Alkaline D Batteries

Alkaline D cell batteries are the most common and cost-effective option. They typically deliver a nominal voltage of 1.5V and are suitable for most household and recreational devices. With their extended shelf life, they are also a practical choice for keeping in emergency kits or backup supplies.

Lithium D Batteries

Lithium D cell batteries are high-performance, non-rechargeable cells that typically deliver 3V or more, depending on the specification. They provide a longer runtime than alkaline batteries and maintain efficiency even in temperature-sensitive environments. While they are typically more expensive, their durability and reliability make them the preferred choice for outdoor, industrial, or professional equipment.

Applications of D Batteries

Because of their size and capacity, D type batteries are commonly used in devices that demand large amounts of power over extended periods. Some typical applications include:

• Large flashlights and lanterns
• Portable fans and heaters
• Portable stoves or camping equipment
• Medical backup devices
• Toys and electronic games
• Portable radios and speakers
• Safety and industrial devices, like alarms and specialised monitoring tools

How to Choose the Right D Battery

Choosing the right D cell battery ensures your devices run efficiently and last as long as possible. Different applications demand different levels of power, so it’s worth considering the following factors before making a purchase:

• Device Type: Consider what kind of device you’re powering. Low- to moderate-drain devices like toys, radios, or portable speakers typically run well on alkaline D batteries. For high-drain equipment such as medical devices, camping gear, or heavy-duty flashlights, lithium D cell batteries are often the better choice due to their higher capacity and efficiency.
• Energy Needs: Understanding your device’s energy consumption is crucial. If the device is used occasionally or requires only moderate power, alkaline D batteries are sufficient and cost-effective. For devices that demand extended runtimes or consistent high output, lithium D batteries provide superior performance.
• Operating Conditions: Think about the environment where your batteries will be used. Alkaline batteries work well for everyday indoor applications, while lithium batteries perform reliably in extreme hot or cold conditions, making them ideal for outdoor, industrial, or emergency use.
• Budget Considerations: D batteries come in a range of prices depending on brand and chemistry. Alkaline batteries are more cost-effective for regular use, while lithium batteries, though pricier, offer better longevity and value for demanding applications.

Why Choose RS Hong Kong for D Batteries?

When you choose RS Hong Kong, you gain access to a comprehensive range of D batteries from world-leading brands such as Duracell, Energizer, Panasonic, Saft, and RS PRO. Whether you’re looking to buy D batteries for everyday household gadgets or sourcing high-performance D cell batteries for industrial and professional use, RS has you covered.

Our user-friendly online platform makes it quick and convenient to browse, compare, and buy D batteries. Additionally, you can rest assured that every product is backed by strict quality assurance, so you can purchase with complete confidence.

Aside from D batteries, RS Hong Kong has other battery types, including AAA batteries, AAAA batteries, coin batteries, and more. Buy your batteries at RS Hong Kong today!

For detailed lead times, shipping options, and coverage, please refer to our Delivery Information page before placing your order.