Finally a very good day to fly here. So I had the opportunity to compare my new TB48's with the TB47.And I can say I'm very happy to see that the difference is even better than I thought. I did have 16 min. ( 16.21)with TB47 and just over 21(21.13) min with the TB48.All batteries did have 10% left. The best thing either is that I can fly for much more than 1 hr now with the 4 batteries.