LTC4040 5V, 2.5A Uninterruptible Power Supply (UPS) with USB-C – Beyondlogic
Amazon.com : TalentCell Rechargeable 12V 6000mAh/5V 12000mAh DC Output Lithium ion Battery Pack for LED Strip and CCTV Camera, Portable Li-ion Power Bank with Charger, Black : Electronics
18650 Battery Shield V8 Mobile Power Bank 3V/5V for Arduino ESP32 ESP8 – diymore