The energyShield - Power for your Arduino Creativity by NightShade Electronics — Kickstarter
Arduino Battery : 5 Steps - Instructables
Small Footprint Arduino Nano With USB Charging Circuit (Li Ion or LIPO) That Can Turn Itself Off (soft Latch Power) : 8 Steps (with Pictures) - Instructables
16340 Lithium Battery Power Shield for Arduino UNO
Powering a pro micro board with li-ion battery and USB connector - Project Guidance - Arduino Forum
Rechargeable battery solution for your MCU Projects? - Motors, Mechanics, Power and CNC - Arduino Forum
Amazon.com: Onyehn 4pcs for Wemos D1 Mini Battery Shield Micro USB Single Lithium Battery Charging Boost Module with Pins LED Indicator 5V 1A DC : Electronics
Amazon.com: energyShield 2 Basic - Rechargeable Battery Shield - Compatible with Arduino Uno R3 : Electronics
Amazon.com: KBT USB Rechargeable 9V Battery: 480mAh Li-ion Polymer Battery with Type C Charging Cable for Smoke Detector/Fire Alarm/Garage Keypad/Guitar/Ride on Toys/Arduino -2 Pack : Health & Household