WeMos D1 Esp-Wroom-02 Motherboard ESP8266 Mini WiFi Development Board Nodemcu Module with 18650 Battery Holder Description The development board integrates the ESP8266 18650 battery. A standard LG 3000mah 18650 battery can run for 17 hours. You can call it “WiFi battery”. I am going to make it easier to develop ESP8266 ESP8266 project to add 18650 battery. Features Compatible With nodemcu (NodeMcu Intergrated on board) 18650 charging system integration Indication LED (green means full of red means · Charging) Charge and work can be done at the same time 1 switch control power supply 1 SMT connector available for sleep mode 1 additional LED programmable (with gpio16 [do]) 0.5a charge current 1A output Overcharge protection Over discharge protection 10 digital pin read / write / interrupt / PWM / I2C / line support (except D0) 1 analog input to be careful + – NOTE: If the battery is in the wrong direction, the board will be burned. This product does not contain 18650 battery.