becouse the batteries standerd alcilines are about 700Mah and that pack is 1100Mah per cell
Alcilines = 1.5Volts x 4 = 6 Vots
Ni-mh = 1.2 volts x 5 = 7.2 volts...

so it will put out more voltage and have a small bit of more power! but to make a big difrence get the futaba s3305 for lots of power or a litter cheeper the s3010