Can I use 14500 instead of AA? 14500 and AA batteries differ in voltage and capacity. 14500 batteries have 3.7V, while AA batteries have 1.5V. They are not interchangeable in most devices, as it can damage them. Specialized devices like AA flashlights may accommodate both. It's vital to follow manufacturer guidelines. Redway offers reliable lithium batteries, including custom solutions, suitable for various applications. It's the answer to Can I use 14500 instead of AA?