I've just recently bought an extra battery for my P4. A DJI local dealer sold me a P4P54 battery which seems very original from DJI. But when I try to install it on, the beneath latch can't lock in place which is really weird since my previous one hook up nicely. So I return to the dealer to day, bring along my P4 and tell them the problem. They're very nice and agree to change for another battery. But the tragic continue to happen. They give me about 6 batteries and all of them have the same problem, which I don't know why. At last, they bring a new P4 out, take out its battery and it's fit nicely. Both latches is hooked in place. I forgot to take a picture compare two batteries and when installed the loose one on the AC. But I look around and find these which could describe my situation best. Compare 2 batteries: Beneath latch can't hook: So I search around and find these. P4 Part 7: DJI Phantom 4 Part 7 Intelligent Flight Battery, (CP.PT.000312) | Staples® P4 Part 54: DJI Phantom 4 Battery - DJI Authorized Dealer Does anyone know why? I hate bringing along my P4 when buying parts or accessories.