Amazon Basics AAA NiMh Rechargeable Batteries, Pre-charged, Pack of 12 (Appearance may vary): Amazon.co.uk: Electronics & Photo
Pack of 4 Rechargeable Ni-MH Batteries 1/3 AAA 80 mAh 1.2 V for Solar Products: Amazon.co.uk: Electronics & Photo
AAA Batteries - Disposable | Cleo
AAA Batteries - 4 Pack, USB Rechargeable Lithium Batteries 1.5V 600mAh, More Than 1000 Cycles Recyclable Recharge Triple A Li-ion Battery, Come with 4 in 1 Micro USB Charging Cable Fast Charging:
Spacer for 18500 Li-Ion cell to replace the 3xAAA battery compartment in those cheap and cheerful flashlights : r/functionalprint