Here is a multi battery and RC charger for the Phantom 4. Its not in any way official but the Phantom 3 variants were very good and reliable, no reason to think the Phantom 4 ones to be nothing but also. They will come from China to expect some days for delivery. Good deal for £40 + £6 delivery. I am sure when and if DJI bring one out for the Phantom 4, it will not parallel charge and will likely cost a lot more..