I've just started using mx-20 that a mate got me onto for rat runs and poor access rears.. No messing about with charge up just sit in the van until needed the pressure is stable down to last drop. http://www.gm-rsprayers.co.uk/marolex_12_16_20_litre_knapsack_garden_sprayers.htm?ac=JPJTN-Mhi, Does it come with pump and battery?