3 AAA LED flashlight 14500 battery adapter

thingiverse

This is a simple cut cylinder for swapping out the standard 3xAAA battery holder found in most common LED flashlights with cheaper, rechargeable, and longer-lasting 14500 lithium-ion batteries! The outer diameter of the cylinder is 22.5 mm, making it suitable for use in almost any LED flashlight on the market. You may need to gently stretch the spring inside the device a tiny bit if the contacts don't line up perfectly. Please be aware that 14500 batteries have a unique shape similar to AA batteries but are actually very different. They will not work properly in most devices meant for AA batteries, and using them in such a device can cause damage or even a power surge, so it's crucial to use them only in compatible LED flashlights.