8PCS PKCELL ICR 10440 AAA Li ion Rechargeable Battery 3.7V 350mAh And battery charger for 1 4PC AA/AAA 18650 3.7V batteries|Replacement Batteries| - AliExpress
2pcs / Lot 3 Aaa Battery Black Plastic Metal Holder Box Housing Cylindrical Type For 18650 Flashlight 65mm * 21mm In Stock - Replacement Parts - AliExpress
Battery Eliminator - 3 AAA Battery Replacement - AC Power, 4.5 V
3 x AAA Cylindrical Battery Holder - BC Robotics
Flashlight Battery 3 AAA Plastic Battery Holder Unit for LED Flashlight Torch
The Best Rechargeable Battery Charger (for AA and AAA Batteries) | Reviews by Wirecutter
Everything You Need to Know About the 18650 Battery
FLPT: an 18500 in a 21700 adapter is a damn near drop in replacement for those terrible triple-AAA holders. : r/flashlight