Monitoring LiPo battery voltage with Wemos D1 minibattery shield and Thingspeak – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Portable Battery Power Supply Shield Kit For Arduino
BatteryDuino - Battery shield for Arduino from Senior Electron LLC on Tindie
AAA Battery Shield
Buy 18650 Battery Charge Shield V3 Micro USB Type-A USB 0.5A Test Charging Protection Board For Arduino at affordable prices — free shipping, real reviews with photos — Joom
18650 battery shield with USB or soldering 3V/5V connector for Arduino, ESP8266, ESP32 projects • DIY Projects
Amazon.com: MakerFocus 4pcs D1 Mini Battery Shield, 1A Single Lithium Battery Charging Board D1 Mini Lithium Boost Shield for WeMos D1 Arduino : Electronics
Diymore 16340 Battery Shield Power Bank Micro USB Type-A for Arduino – diymore