Thanks for the answer Mike! It was planned from the start to hack the E4 for the resolution/palettes and then cut it down to fit on my stereo-camera. At the time of the purchase i didnt knew about ThermApp, but it costs 1k and also has only the E4-resolution and is no UVC-device like the FLIR, so the FLIR is still more suitable for me.
As you mentioned i want to use only USB to power the FLIR, so i taught about the following:
FLIR is connected to USB, also a separate DCDC-converter (5V to 5V, isolated) gets the 5V from the USB, behind the converter is a standard voltage regulator (LM317T for example) including the backcurrent-protection-diode, which sets the converter/regulator-output-voltage to the maximum battery voltage. This voltage is fed into the battery-port to simulate a charged battery.
Any thoughts about that?
As you said im gonna need to disable the backlight-stepup-converter. Also i want to use the commando-UART on the pcb to command the FLIR over RS232-TTL (i assume TTL), instead over Telnet. Do you have a drawing/plan where those UART-pins are on the pcb?