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That depends on the current drawn from it. Standard D cells are rated between about 10,000 mAH to 15,000 mAH. Therefore a load drawing 100 mA from a D cell should give a lifetime of somewhere between 100 hours to 150 hours. More current shorter life, less current longer life.
No set answer to that, it depends on the power consumption of whatever they're connected to.

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7y ago

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