D1 Mini USB 3.3-4.2V Lithium Battery Charger Board with Overcharge Protection

D1 Mini USB 3.3-4.2V Lithium Battery Charger Board with Overcharge Protection

The lithium battery shield provides a means of powering your mini, or mini Pro (see item HCWEMO0002) from a single cell (3.7V) lithium battery.
The shield contains a DC-DC converter to step-up the batteries 3.7V to 5V supplying your mini and shields with up to 1A of power.
When the battery is depleted simply plug the shield into a USB power source using a mini USB cable and it will automatically recharge the battery.
Two LEDs on the shield indicate when the battery is charging and when charging has completed.