I own a hitec x4 and an icharger 4010 duo. The ability to do 4 different packs or different levels is great. However, if I placed a pack on each charger at the same levels, I can charge, race and almost be charged again before the hitec is even done charging. It is very slow. I race only 2s. The way i have gone about charging multiple packs is to only run for 5 minutes ( 2s lipos, I race oval), and then parallel charge. I can charge 8 5000 mah packs in about 20 minutes at 2c with the icharger. The hitec would take about 45, in my experience to balance charge 1. Buy the icharger and parallel boards. Never buy another charger. I know I wont.