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- Thread starter qip
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Some, that can operate over a wider voltage range, can benefit in additional runtime with an added cell.

Mark

When you add cells in series, you add the voltage. When you add cells in parallel, you add the capacity. Capacity = runtime.

Tom

SilverFox said:

When you add cells in series, you add the voltage. When you add cells in parallel, you add the capacity. Capacity = runtime.

Tom

The capacity of Duracell Coppertops depends on the discharge rate and other factors. You'd also have to know if your light engine is as efficient at 3 volts (2 D cells) as it is at 4.5 volts (3 C cells) and whether it puts out more light at the higher voltage and what the cut-off voltage is.

In general, however, there is 35 percent more energy in 2 D cells than there is in 3 C cells.

It's easier to compare the runtime potential of various cell combinations if you convert amp-hour energy to watt-hours, because watt-hours allow you to compare energy capacity in cell combinations of different voltages. Multiply amp hours by voltage to get watt-hours.