This simple, compact A/C Lipoly Charger plugs right into the wall and requires no programming. It charges and balances batteries from 2-4 cells(7.4 volt, 11.1volt, 14.8 volt packs) and has 3 charge rates; 1amp,2amp, or 3 amp. It has and internal power supply and cell balancer. Very easy to use. Just plug in your battery and the charger with its "smart charging " technology does the rest?