Cross posting from reddit (https://www.reddit.com/r/esp32/comments/cdd574/esp32_with_27_epaper_display_wont_wake_up_after/)
Everything works as expected when attached via micro-usb to my computer, but when running off batter connected via JST plug, it won't wake up, or the display will flicker and start to draw but then not finish. 1800 mah Battery is fully charged and showing 4.2 volts.
Board is:
I'm using GxEPD2 as the display driver:
Any one had this issue and were able to solve it?!
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html .
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Have you written code just to sleep and wakeup the ESP32?
Thanks.. Tom.. 
Yup. Turns out the board has an IP5306 chip that doesn't allow the ESP32 to come out of deep sleep if lower power is detected for longer than 30 seconds 