Hello, I am testing various types of heltec boards, and I was surprised by the autonomy of the HTCC-AC01 battery. I have installed a sketch that measures the temperature every minute on a DS18B20 sensor and then sleeps until the next reading.
The battery had 4,286V and has stopped transmitting after 2460 TX with 2,556 V.
If someone wants to see the TS graph, they can do it at this address:
https://thingspeak.com/channels/1071485