@nosfay Thankyou, Im trying a few things with trying to get the av to output but then still auto detect the hdmi when its plugged in, Ill have some spare time tomorrow night while the mrs is working so will give it a proper go then.
The battery, im still waiting on the size i want to be back in stock at adafruit. They seem very popular. Thats currently a lipo that i have 'borrowed' from an old remote control helicopter, was intially a testing battery to check as i was going along with the build. It only lasts about 45 mins with the av screen running, but as im still testing the rig to get the screens working how i want i still have acces to the mains.
Ashley