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D batteries are commonly used in portable music systems, large flashlights, gas heater ignition systems, irrigation timers, and toys.
Alkaline batteries have a shelf life of around 6 years. A D battery measures 61 mm in length and 34 mm in diameter and weighs 139 grams. Rechargeable models HR20 are also available, with the same diameter and thickness but varying weight depending on the model's capacity.
Like all rechargeable batteries, its voltage is 1.2 volts and its capacity in mAh can vary depending on the brand and model.