You can use D1 mini without usb cable, it's really wireless now.Put D1 mini anywhere, using this battery shield and a lithium Battery.Boost, just connect lithium Battery to this shield, power supply for the entire D1 mini system.

1. Connect to lithium Battery (normal 3.3-4.2V), Connector Type: XH-2  2.54mm

2. Charging port (normal 5V)

3. Green LED, lights when charging is completed

4. Red LED, lights when charging

1. J1: setting max charging current, 0.5A or 1A.

2. J2: Connect Battery to A0                              

Support

Shipping list:

• Normal pins x2pcs
• Battery Shield  x1pcs