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EVEREADY SUPER HEAVY DUTY BATTERY D 2 PACK EVEREADY: A long-standing brand known for affordable, widely available batteries. Super Heavy Duty: Indicates carbon-zinc chemistry, which is cheaper but less powerful and shorter-lasting than alkaline batteries. Best for devices that don’t need high energy continuously. D size: A large cylindrical battery (33.2 mm in diameter, 61.5 mm in length), often used in high-drain or larger household devices. 2 Pack: Contains two D-size batteries in one package. Key Characteristics: Voltage: Typically 1.5V per cell. Shelf life: Shorter than alkaline (usually 2–3 years). Use case: Ideal for devices with low or intermittent power demands.