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Is the heltec board based on the ESP32?
Some of them are but the ones with the excellent claimed deep sleep stats are based on ASR605x
Not that it matters if you can't get close to the specs in real life. To be fair, we're getting about 1 year of operation out of the Heltec boards with a 300ma battery with our current code (and attached sensor). It should be closer to 2 years though.
They claim 3.5uA as opposed to the 20uA I said earlier.
Doesn't look like it yet, but I wouldn't expect it to be any better than the Pico (0.8mA in dormant mode).
Is the heltec board based on the ESP32?