Currently have a Hitec X4 ac/dc that does a great job of charging all my lipo receiver packs. Now that I'm getting into the electric side of the house I'm looking for a charger that will do a good job of charging these larger 4s hard packs (5000-7000mAh). From a previous post I have concluded that my current charger would take quite a while to charge up these packs so Im looking for something with more juice. What do you guys recommend? I'm open to needing a power supply also.