Last month I bought a Hota d6 dual pro ac/dc charger, also sold under the hobbymate brand. It is basically a rebranded ISDT D2 but with an added DC input. It is really small, has a 200watt power supply and pretty cheap. With an external power supply it can do 650 watts. It has been really good so far. Only thing I dont like is that the rotary button is quite sensitive.