18500 Li-ion Battery adapter to replace 3 x AAA cartridge
thingiverse
This adapter allows you to fit an 18500 rechargeable battery (or even an 18650 cell) into a LED flashlight that usually takes 3 x AAA batteries. The lower voltage of Li-ion batteries is offset by their low internal resistance, maintaining the flashlight's brightness. Ensure electrical safety; this modification may void warranty and can be risky if not done properly. Successfully used in a Utilitech flashlight from Lowe's Home Improvement. A 3D printable design (45mm tall) is available with adjustable Z-height in Makerware, and new pictures included. Printed in standard PLA; walls are 1mm thick for strength. Adjust the Z-height to fit your flashlight, ensuring the battery doesn't bang around inside.
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