You can get 6000 mAH batteries from Banggood for $89 and GearBest for $81 which should last longer then the factory 5200 mAh battery. I bought a pair of the 5400mAh batteries with the LCD on them and I use them more then the DJI batteries. Long story short, they're not interchangeable
And a different voltage. I got a Bangood battery for just under £40, UK,for P2V+, with LCD display, so far very good, it is the first battery to be used by choice. Took a few weeks to be delivered,but so far excellent. 5400mAh Battery For DJI Phantom 2 Vision+ with LCD Display