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
Rechargeable Battery 5000M Mini 3.7V 18650 3500MAH cellphone powerbank USB LED Battery Charger rechargeable aaa|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
Power Supply for 3 AA, AAA Battery, (2 Pack) 18500 Protected 3.7V Rechargeable Battery 1600mAh with Charger - [Replace 3 AAA, 3 AA Battery for 21, 51 LED UV Flashlight ]
FLPT: an 18500 in a 21700 adapter is a damn near drop in replacement for those terrible triple-AAA holders. : r/flashlight
750 mAh Li-ion Rechargable battery to replace 3 AAA Flashling Battery Cartridge | Rechargeable batteries, Usb charging cable, Micro usb