How long should this setup last? (Single blue LED/CR2032 battery.) : r/led
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DIY How To Connect LED with 3V Lithium Battery - Easy Science Project For Kids - YouTube
voltage - How long will a CR2032 battery take to exhaust powering two 5mm blue LEDs - Electrical Engineering Stack Exchange
Lifespan of CR2032 batteries and LEDs : r/AskElectronics