Amazon.com: uxcell AAA Battery 3x1.5V Storage Adapter Case,18650 Battery Holder Converter for AAA LED Flashlight 1 Set : Electronics
Fast 18650 li-ion battery charger -dual channel-1A per channel
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
Uxcell 18650-Battery Protective Sleeve, Battery Tube Adapter, Holder Converter for 26650 LED Flashlight 4 Pcs - Walmart.com
Amazon.com: 18650 to 21700 and 20700 Adaptor Battery Storage Container(18650 to 21-700 and 20-700 Adaptor) : Musical Instruments
Universal 18650 Battery Charger Smart 2slot Li-ion Battery Ac Charger Adapter For 18650 18500 16340 14500 26650 - Temu
2 Pieces 18650 battery to 26650 Adaptor Converter adapter 18650 tube for 26650 led flashlight torch - AliExpress
Fenix ALF-18 Battery Adapter – Fenix Store
Fenix ALF-18 Battery Adapter – Fenix Store
2A Single Lithium Ion Removable Battery Charger For 18650, 21700 etc. – The Saber Armory