Yes, additional batteries can be purchased for the Master MFG Master Gardener Cart Sprayer via the manufacturer. Their phone number is 1-800-864-1649.
We apologize that your unit isn't working properly now. We recommend to contact Master MFG 1-800-864-1649 as they provide warranty for their sprayers as well as handle all replacement parts and troubleshooting for their units.
The spray pattern for the Master MFG Master Gardener Cart Sprayer 9 Gal. should go from cone pattern to pin stream by turning the nozzle tip itself in clockwise/counter-clockwise direction. If you need further assistance, we recommend contacting Master Manufacturing directly at (800) 864-1649.