18650 BATTERIES ARE MOST COMMONLY USED IN RECHARGEABLE FLASHLIGHTS, CAMERAS, LED CLOCKS, AND PORTABLE SPEAKERS AND FANS. THEY'RE ALSO USED TO BUILD BATTERY PACKS AND POWER BANKS SUCH AS THOSE FOUND IN LAPTOPS. THE 18650 NAME IS BASED ON THEIR NOMINAL SIZE OF 18 MM DIAMETER BY 65 MM LENGTH.
