Cheers Damon. Before I start ordering stuff, do you think this way of doing the mod will actually increase my flight time or are the P2 batts too heavy at 360g each?
You will definitely get extra flight time and extra protection from main battery shutdown. The weight is very good. Neil Watts' dual battery mount (link on first page) should work for these.
I have a P2 gathering dust myself I may give a go at using its batteries as aux for the Inspire,
Good idea!