Amazon.com: CR123A Lithium Batteries,16Pack 3V 1500mAh Non-Rechargeable CR17345 CR123 Battery with High Capacity PTC Protection for Smoke Detector, Flashlight, Camera, Toys (- NOT Compatible with Arlo Cameras) : Health & Household
Is it possible to power the ESP32 directly with a CR123 battery?
Using USB to power NodeMCU ESP8266 : r/arduino
Seven Pro Tips for ESP8266 : 9 Steps (with Pictures) - Instructables
Best CR123A Battery - Rechargeable vs Non-Rechargeable Lithium CR123A Batteries
Web Server with esp8266 and esp32: serve pages and manage LEDs – 1 – Renzo Mischianti
Dual 18650 Lithium Battery Shield V8 3V1A 5V 3A Micro USB Power Bank Battery Charging Module For Raspberry Pi Wifi ESP8266 ESP32|Integrated Circuits| - AliExpress
2x Energizer CR123A 123A DL123A Photo Lithium Battery 3V 1500mAh FAST USA SHIP - Walmart.com
Seven Pro Tips for ESP8266 : 9 Steps (with Pictures) - Instructables
technical stuff, hopefully useful to some: Programming a standalone ESP 8266-12 using Arduino IDE and a FT232RL FTDI USB to TTL Serial Adapter
nodemcu on battery - Let's Control It
PIR Sensor with ESP8266 Nodemcu and Arduino IoT Cloud
Best CR123A Battery - Rechargeable vs Non-Rechargeable Lithium CR123A Batteries