18650 To 21700 Battery Adapter For Astrolux FT01 / FT02 / FT03 LED Flashlight DIY 18650 Adaptor Holder – Alexnld.com
Cafurty Plastic 3xAAA Battery Adapter Tube 3pcs For 18650 Flashlight - Set of 3
DIY Dummy 18650 Magnetic Battery Charger Adapter - A solution to charging 26800's and other large cells without having to buy a new charger (details inside) : r/flashlight
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LiIon 18650 to 26650 adapter by viktori | Download free STL model | Printables.com
Amazon.com: uxcell AAA Battery 3x1.5V Storage Adapter Case,18650 Battery Holder Converter for AAA LED Flashlight 1 Set : Electronics