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Wifi does consume a lot of power, so it won't last long. In this project using a 18650 shield is a good idea, because it means you can recharge the battery every day/week like your smartphone. For long duration, you need to use another radio technology. I personally use panstamps with DHT22 on "battery board" and a single AA alkaline battery (1.5V) goes for 3-4 month. It also monitors the battery voltage, from 1.55V to 0.9V over the weeks. Using a rechargeable 2200mAh AA 1.2V cell would only last 2-3 weeks.
I agree DHT11 is not reliable. However, I use DHT22 for 5 years now, and it is uncredibly stable 0.1°C precision and regularity, checked with "conventional" thermoter. Actually better than the 18B20.
Neat, and congrats for the close to 25k views in less than 1 month ! The biggest issue is not the charging voltage 3.6 vs. 4.1, but faulty BoM and energy drain. The selected Arduino Uno is not usable at all (you didn't use it either BTW). That one is supposed to use 5V, and the selected servo as well. Maybe they would work at 3V3-3V6. There is also a useless Serial-USB convertor in this board and even ... LEDs ! Those will empty whatever battery you use in a few days at best. The first two steps you need to take is to replace the UNO by some specific low-consumption device (I'd recommend some ATTiny), and add some sleeping logic with a wakeup time of 2 seconds for example. I also have serious doubt that a small servo could be strong enough to operate the tap, but since that one is also not in the BoM ... Nor is the LiPo board. So even trying to "be nice", I wonder. Did you really manage to make a working instance of your idea or is this a fake ?
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