Aeroo Pro with Smart Controller

I’m not happy with the battery life actually. I only got the one battery as it stated it lasted 45 minutes. The most I’ve ever gotten was 23 minutes and once at 18% it decided to land right where it was at 18% even after I hit the return to home button. I’ve taken it out in parks to get used to using it over water and today I got 21 minutes and it headed home at 15% and 1 minute later the battery showed 9%