[Smokin' Joe]

I have some of those adapters I bought years ago. They work, with a caveat: no way a AAA or AA will have the amp hour rating a D or C will, so while you get the voltage, battery life is a lot shorter. Good in a pinch, though.

[ansel12]

No, but then again, for survival situations you should be replacing old D cell cell items, with aa.

Also with two aas per adapter being rechargeable and with the way that they release their energy, they can do a good job, just with less runtime.

If you have old D battery flashlights that you like, or have to continue using then you can look into converting them to led.

Regardless of D or AA, the real issue is to quit using alkaline batteries, because they leak and destroy your electronics and flashlights.

[ansel12]

I converted my Schlitz Long Neck bottle flashlight into an LED flashlight.
I used an LED drop-in and D battery adapters for AA Tenergy rechargeables (2 per adapter).

I am now "prepped" as they say with a truly camouflaged flashlight with a much longer battery life.