![]() I could be totally wrong on all of this of course, but think i have it right. A second diode could be added to reduce the impact of this but it may be fiddly as they would have to be where the 1n5189 is so possibly better to not do this. I think the charger board will just see it as a fully charged battery and shut down. There is a 1n5189 blocking diode on the USB which will protect that end but there will be a voltage across the battery as a result which will be at the higher end of the charge curve which is not ideal but not that important if the USB is not in regular use. I am pretty sure it uses an ME6211 LDO regulator or similar, so it should work fine it will operate well below 3.3 volts (2-6 in this case) so will be well within the spec of the battery and the ESP32 voltage. The following diagram shows how the circuit to power the ESP32 with solar panels works. You can use the preceding links or go directly to /tools to find all the parts for your projects at the best price!
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