(TECH)Battery Usage when the RePhone is turned off

[dbelam]

@jianzhang.su

The idle consumption is too high, but if you have a heat gun you can try to remove the D1 Zener diode, the idle consumption can drop to 0.3mA(3.8V) when in “OFF” mode. The Zener diode can protect the power circuit of MT2502, but the current consumption of the Zener diode is too high.

Is that zener really needed there? Is it intended to be an ESD protection or it has other primary function?