Having seen a number of posts stating battery problems I was interested in how much the ongoing costs were to run a Phantom. How many flights do you all get from a battery on average ? I see 20 - 30 flights stated quite a lot, if we assume 17 minute flights and around £100 per battery in the UK ($156) that looks to me like (25 * 17) / 60 = £7 ($11) per hour of flight just in batteries. I think DJI have done a great commercial job adding intelligence into the batteries. It really locks its customers in. I think this stinks. I would be interested to hear other views on whether you think the running costs are excessive or not, and if there are other significant things I have missed.