Super Size Your Battery Run Time: D Cell Battery Packs
The original story here: http://www.instructables.com/id/Super-Size-Your-Battery-Run-Time-D-Cell-Battery-Pa/
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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Related article:
LED Lighting: One “Dead” D Cell At A Time.
http://www.instructables.com/id/LED-Lighting-One-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.