I made a easy project to measure temp and humidity basen on guide I found on intnernet, and I connected it to Blynk so I can read the values directly on my smartphone anytime - link
Basically I did the exactly same setup, only difference is that I did not use any capacitor.I have connected:
- battery 18650
- voltage regulator 7333
- ESP 8266-01 (with deepsleep, to measure every 5 mins)
My problem is that battery lasts only 21 days what is really sad for me. Based on project I linked I expected at least 2 months.
I did also current measurements and during measuring current was 80mA for a few seconds, in deepsleep 39uA
At the beginning the battery had 4,2V, then after 14 days 3,94V and after 20 days (from beginning) less then 1V.
Do you see any reason why it works only 3 weeks? Comparing to other project I expected much more. Any idea how I could extend the life for 2-3 months (but I want to keep size of the project as small as possible)
Thank you very much