For small projects (like the iCufflinks) you’ll want a small battery. When even a AAA is too big, look to lithium coin cells! These are common, often used in calculators, watches, etc. We have two favorites, the CR2032 which is 20mm in diameter and the CR1220 which is 12mm. They are very popular sizes, and have other variations that may be less common (such as CR1216 which is only 1.6mm thick). Be sure to check our coin holder section as well to find a matching holder.
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