Adafruit Huzzah ESP8266


Does anybody know if there is a way to check if there is a battery connected to the Adafruit Feather Huzzah?
There is only one ADC on the ESP8266 which i have used to measure the VBAT voltage. However, even when no battery is connected the voltage is still high at 4.0V which doesn’t tell you if a battery is installed?

I was thinking since the LiPo charging IC has a PROG/ENABLE pin i could use that to disable charging and perhaps that would show a open circuit at the VBAT pin??? Would this work?

Anybody else have an idea?