Wemos D1 Mini ESP8266 Power requirment - Hardware - Arduino Forum

Hi, Can anyone confirm from experience what is the lowest voltage, that is ok to use to power a D1 MINI ESP8266 via VIN/VCC pin? On the official requirement it says Power Supply via VIN,VCC takes 4V to 6V The problem is most battery power module like TP4056, doesn't have boost module. So output voltage is as high as battery voltage (or bit lower). Meaning with a 3.7v lithium cell, once battery is drained from its peak 4.2v, it might come down to even 3.5v. Question is, is it safe to power D

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