@OziGreybeard, 1.5.0 allows you to completely disable the new DeviceOS System Power features.
Something similar to this might get you started:
SYSTEM_THREAD(ENABLED);
PMIC pmic;
SystemPowerConfiguration conf;
STARTUP( turnOffPowerFeature() );
// see https://community.particle.io/t/boron-solar-charging-with-1-5-0-rc1/54680/10?u=rftop
void turnOffPowerFeature() {
conf.feature(SystemPowerFeature::DISABLE);
System.setPowerConfiguration(conf);
pmic.begin();
// all of the PMIC calls that you want go here
pmic.disableCharging();
}
void setup() {
}
void loop() {
}