Product: Wagner 18V 2AH Replacement Battery

What is the difference between the FLEXiO 3500 and the FLEXiO 3550 18V Cordless sprayer?

The FLEXiO 3500 sprayer comes with a convenient on/off switch, a nine speed setting X-Boost turbine, the iSpray Nozzle, and the Detail Finish Nozzle. The FLEXiO 3550 18V Cordless sprayer comes with a five speed setting...