I'm using an iCharger 206 with a Paraboard V2. With thise, I can charge up to 6 batteries at a time and vary the amperage to handle the number of batteries being charged in parallel. I power the charger at home with a G.T. Power Rc power supply, 110v/220v in, 12v out. You can up the amps to whatever you might need. The iCharger also has the ability to connect to the 12v solar power station and the R/C field where we fly.
Just make sure that whatever you buy is quality equipment. Nothing will ruin your day more that a battery explosion or fire on your workbench because of an el cheapo charger cranking out more amps than the battery can handle.