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.

1. Connect to lithium Battery (normal 3.3-4.2V)

2. Charging port (normal 5V)

3. Green LED, lights when charging is completed

4. Red LED, lights when charging

V1.2.0

Features

• Charging Voltage: max: 10V, recommend: 5V

• Charging Current: max: 1A

• Lithium Battery voltage: 3.3-4.2V

• Boost Power Supply: 5V(max: 1A)

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