A neat 18650 Li-Ion battery HAT for the Raspberry Pi. Allows you to run your Raspberry Pi without a cable and also charge your Li-Ion battery. Battery voltage and status can be read from the Pi with a Python script.
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We have also added a voltage regulator on the USB input so various voltage supplies and solar panels can be used. There is now a 4x2 100mil header to accommodate an ESP8266 module for remote monitoring and Pi reboot.