This charger  , and a few other similar ones , are only like having four little chargers in one box. The limiting factor , is that they all have only 50 watts per channel. Before getting one , you should educate yourself by studying these two web sites,   EP BUDDY.com  and also PROGRESSIVE RC.COM   These both have demo videos on parallel charging , and sell the necessary equipment , good powerful chargers , power supplies , and parallel charging boards and parallel charging wires. Both sell two very good makes of chargers that come in several sizes.  I-Chargers and FMA Chargers. Both places are in USA and the service is excellent .I can't say the same about Hobby KIng.  I also found a bunch of talk about Parallel charging on some R.C.forums , by Googling for it. Read the customer comments on Hobby KIng , before buying anything. The trouble is that after you learn a bit , you realize that you are going to have  to spend more money. You just cant get a powerful charger for $100.  Keith Varley