No WIFI when running Wireless Beaglebone Black on Battery

[nuz...@gmail.com]

Wifi is not powered up when running off of a 3.7v Lithium Ion battery.  Schematic shows a series diode (D2) to source SYS_5v to the wifi regulator.  This diode is missing on my Wireless Beaglebone black.  

Is there some reason why this part has been omitted?  

I also have an older Beaglebone Black (Ver A6a) with the wifi cape modified to be powered off of the SYS_5V.    The wifi-cape look to be basically the same circuit as on the wireless Beaglebone Black.  I have not seen any problems with wifi running off of the lithium-ion battery.

Thanks for any assistance,

Art