>Menu option d14 is where you set the order for the battery >usage. I have mine set to the grip battery first then the >camera battery. This works for me but then I have the genuine >grip. It's possible that if you have the settings correct >there may be a compatibility issue with the 3rd party grip. > >If it is a compatibility issue you could dive into the d13 >setting and tell it to use the camera battery first when the >grip battery is getting low as a workaround. It's kind of hard >to do quick tests on how the features work as the batteries >last so darned long!