I know everyone is biased to the 18000 model batteries, but what about RC batteries? I saw a video online of a guy building a DIY APV and he used 2 RC Plane flat batteries instead of the normal 18650 batteries because he wanted a more compact, but still powerful APV. Any suggestions on this? Here is the batteries I was looking at, if not safe, I don't want to buy them and I will need a new Hammonds case. 2pcs x 3 7V 1200mAh 25c LiPo Battery for RC Double Horse 9074 9051 9009 New | eBay