Get the cheapest, I suppose. Just check where it's shipping from since it's best if sourced locally. Otherwise, shipping from abroad could take about a month to get to you. You could also try the following (it's an ad from a closed FB group called LOWDOG RC GROUP): I only have two batteries... one came with the drone and another battery given to me a gift last Christmas by a fellow drone flyer in the office (he bought 4 batts + a 4-way charger from gearbest). I only have the stock USB charger.