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Put D1 mini anywhere, using this battery shield and a lithium Battery. You can use D1 mini without usb cable, it's really wireless now. Connect to lithium Battery (normal 3.3-4.2V). Charging, when the battery run out, you do not need to unplug the battery, just using usb port to charging.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.