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Super Size Your Battery Run Time: D Cell Battery Packs

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Based on information from Panasonic I have discovered the following in regard to battery run time:

Using the same load for each size alkaline battery….

1 D cell = 3 C cells

1 D cell = 7 AA cells

1 D cell = 18 AAA cells

6 D cells = 200 9 volt batteries.

Think of the cost savings replacing 72 AAA batteries with 4 D cells.

To greatly increase my run time I have made some D cell battery backs as well as modifying an existing product to do double duty as a battery pack.




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    • wirkbot

      Related article:

      LED Lighting: One “Dead” D Cell At A Time.

      The run time on a new alkaline D cell was 144 hours.

      From the article:

      I currently have an ongoing supply of “Dead” (actually half used) alkaline D cells from a local manufacturing company. They use D cells in a couple of pieces of equipment as well as the automatic paper towel dispensers in all the restrooms. I understand from my friend who works there that they are charged a fee to dispose of them properly. So we are being green by completely depleting these batteries instead of buying new ones and also saving this company money. I believe the towel dispensers are the reason why so many of the batteries I get test at 1.1 to 1.4 volts. I assume the motor that turns the great big roll of towels draws a lot of current.

      I bought a two pack of Eveready single D cell flashlights (model: EVEL152S). You can get these for under $5 if you shop around. They work well and I really like the click on / click off push button switch. I like mine (pictured above) better as a reading light and task light and emergency light around the house because of the following features:

      Variable control for light intensity

      RCA / Phono jack output for interchangeable LEDS.

      The output jack also allows you to connect any length RCA cable to run the LED where needed.

      Operates from 0.5 volts to over 3 volts input voltage under load.

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