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ESP8266 D1 Mini Pro WiFi NodeMcu Data Logger Shield DS1307 Battery 0.66 OLED DC Power Buzzer V1.0.0 Dual Base for WeMos DIY Kit|Integrated Circuits| - AliExpress
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ESP8266 - Li-Ion Battery Rechargeable Battery Power Solution : 4 Steps (with Pictures) - Instructables
GitHub - jaycollett/ESPBatterySense: Battery powered ESP8266 based sensor using the BME280 and MQTT communication
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