Hobbico MKII field charger is a good value bout $50. dual outputs, variable charge rate and can do Ni-cad,Nimh, lipoly/l-ion. It's simple to use and can be used at home if you have a 12v power supply,obviously a 12v battery would work also I have a supernova and find my self using the hobbico more often due to the dual outputs and simplicity.

John