Re: LEDs – Expanding Batteries – CR2032 to 2 C or D size

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#21803
Windell Oskay
Keymaster

It’s straightforward, but you should use the method described in the article: Start with the current and voltage, and work forward to the resistor that you need.  

The mAh rating of a battery should only come in as a secondary consideration.  That rating simply means how much energy is stored.   If you are using two C cells in series, each rated for 8000 mAh, then you have 3 V total, with a capacity of 8000 mAh.  Thus, if you were drawing 1 mA through the batteries to your LED, then it would run for 8000 hours.