Capacity Comparison Table
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Selecting the right battery for the right application is a common choice. Trade offs in battery selection are cost, size and capacity, and internal resistance. Battery capacity is rated in Amp-hours. If you know how many Amps the device will draw, you can figure out how long the battery will last by dividing the capacity by the current draw. If a battery has a capacity of .5 Amp hours, that means it can drive .1 amps to a load for 5 hours or conversely .5 amps for 1 hour, until the voltage drops to a specified threshold, which is typically about half the rated voltage.
The following table is a comparison between various common battery types.
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