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D batteries are commonly used in portable sound systems, large torches, and big flashlights, for ignition systems of gas heaters, 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, weight may vary depending on the capacity of the model.
Like all rechargeable batteries, its voltage is 1.2 volts and capacity in mAh may vary depending on brand and model.