I'm making myself a shopping list as I save up for a P3S...(I'm in two minds whether it'll be a 4K, but thats a different story)...and having read some scary articles on lipo batteries, wondered whether I should include a safety battery container on my list...and that got me wondering, what would those with experience say are the items that are an absolute must, when starting off?....I have a wish list but think I could probably live without some items to begin with...so any suggestions for what I must absolutely include would be very welcome.. thanks