My P2V+ is IMPOSSIBLE TO GET THE BATTERIES OUT! I agree this is a major problem. I consider myself stronger than most. Both of my batteries are a problem, which makes me wonder if the problem is with the Phantom. If I didn't enjoy the video capability so much, I would return the entire product. There is no way anyone else in my family would be able to get the flight batteries out.
I just received a Phantom 3 Professional today that had the same problem. I was absolutely HEARTBROKEN, because I had this problem once before with a PV2+ V3.0, which I had to exchange.
But, as it would turn out tonight, the problem was ONLY with one of the spare batteries; after an hour's worth of trying and almost getting a blister on my thumb (having already used the two-handed approach, using the motor arms for leverage), I was finally able to remove it by holding the drone and having my fiancée pull the battery out!!! Here's a link to a YouTube video of someone having the same problem with the Phantom 3 Standard.
Fortunately, this time, I'll just be exchanging a battery; the problem here was that the upper clamp could not be depressed for removal.
This may not come as a consolation but, this problem is being reported with the 3 line, too.
You may want to look at the claws on the battery that keep it in place; they may be just a little too tall. If that's the case, you can try filing the clasp(s) but, be careful not to file them down so far that they're too loose; the last thing you want is to have a battery pop out in flight!!!
Be careful with lubricants like silicone, oils, grease and others, as they may cause dust and grime accretion; this will only serve to further exacerbate your situation.
Hope this helps!!!
-Joe