I have a simple question regarding the new version of Wemos D1 Mini Pro v2.0 and specifically about its load sharing circuitry. Schematic is here :
Battery charger is TP4054 and there's a load sharing configuration based on P-MOSFET CJ2301.
My question is what happens if you do NOT connect any battery.
It seems that the charging LED faintly flashes, and positive voltage appears in positive battery terminal. Moreover, voltage appears in A0 and ADC input (provided that SJ1 is connected), while someone would expect a zero voltage there, since there's no battery.
Am I missing something here? Is there any way to fix this issue?