I have started to kit out the airframe.
This is the 4s lipo (center battery) for the APM
Also there are 2 x 3s lipo (rebuilt from old laptop batteries) that are for the flight computers.
The main APM battery lasts for around 5 hours so I am also building a battery change over to switch to a backup battery if it runs low. I would like to achieve a total flight time of around 10 hours