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Unread 10-05-2012, 05:08 PM   #3
Green Girl
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Join Date: Apr 2011
Posts: 9,978
IIRC most button cells (technically all "batteries" are cells and a battery consists of several connected cells but only D cell and button cell batteries are called them for some reason) are 1.5 volts for small ones (you can also get slightly larger lithium ones called "coin cells" which tend to be 3 volts). Here's a diagram of the different sizes.

As long as you've got the polarity correct, you'll be fine arranging them that way (you can also slide a small piece of paper or plastic in between the cells to act as a switch if you're really hard up for space) but you might have some trouble keeping them in place without some sort of clip...

Button cells last for ages (button and coin cells are designed to provide constant low voltages for long periods of time) and I doubt a single LED's going to tax them much.
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