Hi ESP_Sprite, this is very interesting what you mentioned. It is indeed using an AMS1117 regulator. My USB Volt/Ampere Meter measure Amps - and is stating 0,02A / 20mA in deep sleep. So there is definitely something there. Using boards with included battery connector makes sense. Found these 2, and...

Hi ESP32 Forum, I hope you can help me understand why my setup is eating my battery within 24 hours even though it is in Deep Sleep mode. Helpful friends on the Blynk Forum (see my post) has helped a lot - but I still does not have my problem solved. https://community.blynk.cc/uploads/default/optimi...