You're right, C and D batteries both are 1.5 volts. Actually, AA and AAA are also 1.5 volts. That makes you wonder what the difference is. If they're the same voltage, why not just use all AAA batteries and make things lighter and smaller.
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The four batteries in parallel will together produce the voltage of one cell, but the current they supply will be four times that of a single cell. Current is the rate at .
AA, AAA and other, less standard, batteries put out a nominal voltage of 1.5 volts. The voltage in these batteries will slowly decrease throughout the batteries' .
Battery Type, Capacity (mAh), Typical Drain (mA). D, 13000, 200. C, 6000, 100. AA, 2400, 50. AAA, 1000, 10. N, 650, 10. 9 Volt, 500, 15. 6 Volt Lantern, 11000 .
Voltage calculations include measuring the mid-way point from a full-charge of 4.20V/cell to the 3.0V/cell cutoff with a 0.5C load. For Li-cobalt the mid-way point