I had a bad battery with my Q500 4K when I purchased it. I tried to register the drone on the website so I could put in a claim. The site kept giving an error and not completing the registration (Tried 3 computers and 3 different browsers IE, Opera, Chrome). I then took a photo of my receipt, the battery with error and all the registration info they required and tried to email tech support. 3 different emails bounced back as undeliverable. Needless to say, I was getting frustrated. I don't know why, but the fourth email went through using the same address from their site (The address included in the box definitely did not work). I received an email from a Customer Service Rep within 12 hours. He registered my drone, ordered me a battery and apologized for my trouble. They did not even want me to ship the defective battery back to them. From starting to think I made a mistake to happy I purchased from Yuneec. They really are a good company to deal with.
P.S. My gimbal is crooked when powered off as well, but straightens up upon booting. I love this drone!