What to use for a dummy cell?

flatline · Oct 10, 2011

I've recently purchased a bunch of 1.5v PR LED bulbs that I intend to use in my old 2-cell (AA, C, and D) flashlights. Naturally, since I'll only be using one cell instead of two, I need something to fill the empty space and still make a reliable electrical connection, but I'm not sure how to proceed.

What do you guys use for dummy cells?

--flatline

ElectronGuru · Oct 10, 2011

Get a bunch of dummy AAs (aw) and AA to C and AA to D adapters.

fyrstormer · Oct 10, 2011

Lighthound sells dummy cells.

LEDAdd1ct · Oct 13, 2011

I use an AW dummy AA in my night light, and it works fine. Best bet is the sales thread on the MP.

HotWire · Oct 15, 2011

The dummy cell take up the space and carries current from the real batteries to the bulb. It does this without adding any extra voltage. Sometimes you need the cell to balance the need that the bulb/LED has for voltage and the voltage supplied by the batteries. I used to make them. Now I find it easier and cheaper to buy them. I'm looking at a bag of dummy cells that I made from aluminum right now. I should put those away.

Lynx_Arc · Oct 15, 2011

you could try getting some springs and wrapping them with something. Maybe even find springs the fit inside PVC pipe cut the length of a battery and wrapped to match the diameter

RCM · Oct 15, 2011

For AA I just use a dowel wrapped in aluminum foil wrapped with electrical tape...doesn't fit everything but works for me...

What to use for a dummy cell?

flatline

Flashlight Enthusiast

ElectronGuru

Flashaholic

fyrstormer

Banned

LEDAdd1ct

Flashlight Enthusiast

HotWire

Flashlight Enthusiast

Lynx_Arc

Flashaholic

RCM

Enlightened

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