Some have been mentioned already:
- Risk of running the battery flat. Try to organise your flights so that you are overnighting at an airfield where you can get a jump start in the morning.
- In an emergency you will not be able to switch everything off by switching off the Master Switch. You may be able to achieve the same by switching off individual components and/or pulling circuit breakers (if they're the type you can pull).
- Check whether any components are directly connected to the battery bus (they should not be). Make sure all the other switches are operational, so that you can switch off all lights (internal lights are sometimes forgotten), all the avionics and all other electrically powered stuff.
- I am not familiar with the type, but have a look if any electrically powered equipment is essential for your flight(s). You will be running a slightly higher risk of electrical problems (it's not a significantly higher risk, most likely, but it has increased) so make sure that if the brown stuff hits the rotating blades, you do not lose anything that you will be relying on.
That's all I can think of right now.