2 Pieces 18650 battery to 26650 Adaptor Converter adapter 18650 tube for 26650 led flashlight torch - AliExpress
3D printed 14500 to 18650 adapter : r/flashlight
Fenix ALF-18 Battery Adapter – Fenix Store
Universal 18650 Battery Charger Smart 2slot Li-ion Battery Ac Charger Adapter For 18650 18500 16340 14500 26650 - Temu
LiIon 18650 to 26650 adapter by viktori | Download free STL model | Printables.com
Streamlight - Battery Chargers; Battery Size Compatibility: 3.7V; Battery Chemistry Compatibility: Lithium-Ion; Charging Time (Hours): 3.50; Charging Time (Minutes): 210; Maximum Number of Batteries: 2; Voltage: 3.70; Includes: 120V AC Adapter; USB