ESP32 Mailbox works on USB power but not battery - Need Help With

Hi forum, even though it turned out to be a simple code at the end - I was thrilled that after many hours of investigation and testing I finally got my Mailbox notifier to work. It wakes from deep sleep triggered by a reed switch. Now I hooked it to a battery (I have tried both 3xAAA and 1x18650) but now it does not wake up from deep sleep. What am I missing? #define BLYNK_PRINT Serial #include <WiFi.h> #include <WiFiClient.h> #include <BlynkSimpleEsp32.h> char auth[] = "blynk code"; ch

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DIY WiFi mailbox sensor with ~12 years of battery, featuring ESP-NOW for subsecond transmission rates and MQTT. More info in comments : r/homeassistant