The 787 can dispatch and operate 180 minutes ETOPS with the APU battery inop or even removed, as long as the Variable Frequency Starter Generator is working.
The same restriction applies to the APU itself. You can operate 180 minutes ETOPS with it inop or removed, (as long as the VFSG works).
Last edited by whatdoesthisbuttondo; 29th Mar 2013 at 10:10.