
Have you ever needed a D battery in a pinch, but could only find Cs? Since AAA, AA, C, and D batteries are all 1.5 volt cells, they are electronically interchangeable. They differ only in physical size and energy storage capacity. So, if you’re in a pinch, you can cobble together an adapter with a few quarters or other suitable conductive material.
Even a 9-volt battery is made up of 6 1.5 volt cells, which are a bit smaller than a AAA (they are actually called AAAAs!). This could come in handy if all you can find is a 9 volt and you really need a AAA for your TV remote… You’ll just have to spend some time cracking open the 9 volt case with a pair of pliers to get at the little cells inside.
Quick hack: The $1 C-to-D adapter -Link
9 volt to AAA conversion – Link

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My grandpa used to do this 40+ years ago! We never used to get the right sizes readily those days!
That must be a dedicated one. Please join Worldwide Battery Resources to gain more information.
That must be a dedicated one. Please join global battery directory at http://www.global-battery-directory.com to gain more information.
this sounds cool! Im so going to try this
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