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Driving a high voltage blue LED from low voltage coin cell using a super cheap charge pump circuit - YouTube
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Blinking Blue- Powering a 3.7 volt LED from a 2.4 volt coin cell with a $0.02 charge pump | josh.com
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3 Volt Small coin cell holder with separate switch | Electronics projects diy, Diy art projects, Led projects
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Amazon.com: Taysing LED Light Emitting Diode Round with Battery Holder Coin Cell Holder Assorted Color White/Red/Yellow/Green/Blue Kit Box (φ3mm 1000pcs) : Industrial & Scientific
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