mAh = milliamp hours, which is battery capacity
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That would depend on the actual battery's specifications. I've seen some D cells rated as low as ~2000 mAh. However a full true D cell should have a rating between 10,000 mAh and 15,000 mAh.
These figures represent capacities of use for batteries. If a device uses 50 mA an hour on a 800 mAH battery, the device would operate for 16 hours before depleting the battery. If the same device was connected to a 700 mAH battery, the device would operate for 14 hours before depleting the battery.
probably, yes. imagine putting twice a much AA's in your radio or whatever.
You measure it with a clamp-on ammeter.
it is the Acronym for Milliamp hours No, not an acronym. It's just an abbreviation, which should be written mAh. A small battery's capacity is given in mAh, and is the approximate product of current and time. e.g. 500mAh means it can deliver approximately 500mA for 1 hour, or 50 mA for 10 hours etc, pro rata. Larger batteries have their capacity stated in Ah.