Amazon.com: aunstarwei 29.4V 2A Charger Power Supply Adapter for 24V 7S Lithium Battery Pack, Li-ion Battery Charger, DC 5.5x2.1mm : Electronics
Parallel charging adapter for two 18650 / 18500 cells using XT-60 charger : r/functionalprint
Amazon.com: Plastic 18650 Battery Storage Case 2 Slots x 3.7V for 2x18650 Batteries Holder Box Container with ON/Off Switch, Set of 5, by Ltvystore : Electronics
LiitoK Portable Super 18650 Rechargeable Lithium Ion battery pack capacity DC 12 V 6800 Mah CCTV Cam Monitor 12.6V 6.8ah - AliExpress
Maglite (7.4V) 2D18650 Battery Adapter Kit | This is the bat… | Flickr
Mag-Lite 18650 Lithium Battery Adapter - YouTube
3D Printed Battery Adapters - Want to Sell - BudgetLightForum.com
Designed an 18650 to 2x D Cell adapter with charging for my Maglite. : r/flashlight