Use Li-ion Batteries Instead of Alkaline - Appropedia, the sustainability wiki
Everything You Need to Know About the 18650 Battery
Rechargeable 24v 20ah Lithium Ion Battery Pack With Bms 7s For 250w 350w 24v Electric Travel Scooter Wheelchair +5a Charger - Rechargeable Batteries - AliExpress
Amazon.com: Geekworm Raspberry Pi 4 UPS, X703 V1.2 18650 UPS Shield with Auto Power On Function for Raspberry Pi 4 Model B Only(Support one 18650 Battery) : Electronics
18650 BAK 3050mAh 6.1A - Protected Button Top Battery – Battery World
Samsung 25R 18650 20A Flat Top 2500mAh Battery - Genuine - Wholesale D – Liion Wholesale Batteries
Hackaday Dictionary: Lithium Ion Batteries | Hackaday