Hey guys, Need a little help here. Searched previous posts and couldn't find what I'm looking for. Have an exmark walkbehind mower does not have electric start. I want to mount a spray tank on the front of it with a single nozzle (boom pattern) that sprays out front of the mower. Anway, mounting and stuff is not a problem, but if it's an electric sprayer and my mower doesn't have a battery and mount a battery do I need to constantly charge it?? How long will it last?? Can I tie it in with my mower so charging is not neccesary? Thanks in advance.