ER... YOU mean your lens kanna lens condensation???
I remember my first night at the hotel. I was out with my tripod trying to get some night shoot. It was very cold.
After the shoot, I straight away went into my room & later discovered that my len front glass with some condensation. Scared me, I thought liao away. But luckily, it's only the external & after cooling down a while more. It's ok already.
My 6th day going to take the balloon in the early morning ( It's very cold ). After quite a few shoots, my battery power become 50%. Just prepared additional battery in case.