I went into BEST BUY today and there was a Phantom4 on the shelf. I asked the sales man if he had any extra battery. he went into the back room and came out with the battery. now he starts to climb the ladder to get the Phantom4 and I told him I just wanted the battery. he told me someone had bought a Phantom 4 yesterday. now he tries to ring up the extra battery but it won't ring up so he calls the manager and they go back and fourth. now he tells me that I can't buy the battery until tomorrow morning april first. I could buy the phantom 4 today but notthe extra battery. interesting.