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D battery size compared to a C and AA batteries

The size of an D battery compared against a common AA (double-A) and C battery.


Length 61.5 mm
Diameter 33 mm


Voltage 1.2V, 1.5V, 3V, 3.6V
Chemistry Alkaline, NiMH, LiSoCl2, NiCd, Carbon Zinc, Lithium
Capacity 3000 – 20,000mAh
Rechargeable Yes, some

Replacement Sizes

13A, 13D, 813, AL-D, AM1, D, E95, EN95, KD, LR20, LR20XWA, MN1300, MX1300, PC1300, R20

What are D Batteries?

The D battery (or R20 battery) is a cylindrical dry cell classified by its 61.5mm x 33mm dimensions. They boast very large capacities upwards of 20,000mah and were often used in flashlights, but today are used more for lanterns, megaphones, radios, and devices that need high-discharge currents and abundant energy storage. Learn more about D batteries here.

Are there rechargeable D batteries?

Yes, rechargeable D batteries use NiMH (nickel-metal hydride) or NiCd (nickel-cadmium) chemistries and have a 1.2V voltage compared to the typical 1.5V of primary batteries. A lower voltage may not affect your electronics' performance, but you should always check with your device's user manual to see if a battery voltage or chemistry is compatible.

NiMH rechargeable batteries have a higher self-discharge rate than alkaline cells, and are susceptible to warm climates. We recommend using NiMH D batteries in devices that see regular use to minimize self-discharge energy waste.

Do D batteries expire?

Yes, all batteries eventually expire. D-cell batteries have a range of shelf lives between 3 and 10 years (although some specialty D batteries can last up to 25 years), largely dependent on the battery's chemistry and storage conditions. We list the rated shelf life on all our product listings when available so you can make an informed choice when buying spares or bulk cells. For more information, check out our battery expiration guide!

Can I use C batteries instead of D batteries?

No, unless you own a trusted battery-adapter sleeve specifically designed for that purpose. C and D cells have very different dimensions (C batteries are 26.2mm x 50mm, while D batteries are 22.3mm x 61.5mm). Do NOT use DIY (do-it-yourself) tricks and guides to modify batteries, as it can have dangerous results.

What D-cell battery brand is right for me?

We carry a wide range of D batteries for personal and professional use. While we don't play favorites at Battery Junction, popular brands include Energizer, Duracell, Rayovac, Tenergy, and Panasonic.

Brands such as Xeno, Saft, Tadiran, and Ultralife are usually only for industrial and professional users, as their cells feature higher voltages for specialty purposes.

What D battery lasts the longest?

Runtimes are often dependent on your device's energy consumption and operating temperature, but batteries with larger capacities (mAh) have longer overall runtimes. D cells tend to max out at 20,000 mAh, and you can filter our wide selection of batteries by min/max capacity.

Do you offer bulk-pricing on D batteries?

Yes! A large selection of our batteries can be bought in bulk, letting you take advantage of huge discounts! You can filter our selection of batteries by bulk-eligibility, fill out a wholesale request form, or directly contact a member of our sales team now via phone or email!

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