Features:

Compatible with nodemcu.
18650 charging system integration.
LED indicator (green for full, red for charging) can be used while charging.
Switch control power supply.
SMT connector available for sleep mode
Additional LED Programmable (gpio16)
0.5a charge current
1A output
Overcharge protection
Over discharge protection
10 digital pin read / write / interrupt / PWM / I2C / line support (except D0)
The analog input should be careful quot;+ - quot;.
Packaged without battery. ,please note:
If the positive and negative direction of the battery is placed incorrectly, the charging chip will be damaged.

Note:
Packaging not include battery. Need to prepare by the user.

Specifications:

The development board integrates the ESP8266 18650 battery. A standard 3000mah 18650 battery can run for 17 hours or more.
This product can be called quot;WiFi battery quot;

Packing List:

1 * Wemos D1 Mini WiFi Module with 18650 battery slot